ALBERT

Description:    It has been shown that the description of the details of the electronic spectra obtained by the combination of the dynamical mean field theory, quantum Monte Carlo methods, and the maximum entropy method can be significantly improved by changing the last method to optimal regularization of the analytic continuation of the Green’s function to the real frequency axis. Starting with the quantum Monte Carlo data, this method has reconstructed peaks in the structure of Hubbard subbands with a maximum error of 0.001 to 0.01. Owing to the universality of the quantum Monte Carlo method, by varying hybridization, it is possible to determine the features of the hybridized function that are responsible for the formation of the structure of Hubbard subbands. It has been shown that there is no direct relation between the peak structure of subbands and the central Kondo peak. The result indicates the charge nature of resonances responsible for the formation of the peak structure. Content Type Journal Article Category Methods of Theoretical Physics Pages 768-773 DOI 10.1134/S0021364011220073 Authors I. S. Krivenko, Faculty of Physics, Moscow State University, Moscow, 119992 Russia A. N. Rubtsov, Faculty of Physics, Moscow State University, Moscow, 119992 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 94 Journal Issue Volume 94, Number 10

Description:    The spallation of a nanometer-thick melt layer on a GaAs surface during its ablation by femtosecond laser pulses occurs with subnanosecond delays and lift-off velocities that depend on the laser fluence after its complete thermal (hydrodynamic) expansion/acoustic relaxation. The position of the spall interface in the melt is determined by the depth of the formation of a two-dimensional subsurface layer of nanobubbles (nanofoam), whereas the strongly heated surface layer of the melt above the nanofoam is partially removed in the form of a vapor-drop mixture. At the thermal expansion stage, acoustic reverberations are observed in the melt layer and characterize both the dynamics of an increase in its thickness and the shift of the cavitation region (nanofoam) inside the melt. Moreover, these reverberations can additionally stimulate spallation, promoting cavitation in the completely unloaded melt in the case of passage of a weak rarefaction wave. Content Type Journal Article Category Condensed Matter Pages 753-758 DOI 10.1134/S002136401122005X Authors A. A. Ionin, Lebedev Physical Institute, Russian Academy of Sciences, Leninskii pr. 53, Moscow, 119991 Russia S. I. Kudryashov, Lebedev Physical Institute, Russian Academy of Sciences, Leninskii pr. 53, Moscow, 119991 Russia L. V. Seleznev, Lebedev Physical Institute, Russian Academy of Sciences, Leninskii pr. 53, Moscow, 119991 Russia D. V. Sinitsyn, Lebedev Physical Institute, Russian Academy of Sciences, Leninskii pr. 53, Moscow, 119991 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 94 Journal Issue Volume 94, Number 10

Description:    A planar homogeneous waveguide array with two-level systems has been considered. The evolution of an electromagnetic field is described by the Maxwell-Bloch equations taking into account the action of the fields of neighboring waveguides beyond the slow-envelope approximation. It has been shown that the model in the continuous approximation is reduced to an integrable system of equations, including the case of a nonzero static dipole moment. The model can be used to analyze the nonlinear mechanism of the compression of pulses and the conditions of overcoming of the diffraction limit. Content Type Journal Article Category Optics and Laser Physics Pages 837-839 DOI 10.1134/S0021364011240106 Authors A. A. Zabolotskii, Institute of Automatics and Electrometry, Siberian Branch, Russian Academy of Sciences, Universitetskii pr. 1, Novosibirsk, 630090 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 94 Journal Issue Volume 94, Number 12

Description:    An array of non-overgrown InAs/GaAs quantum dots has been decorated with adsorbed metal atoms in situ in ultrahigh vacuum. Their electron and photoemission properties have been studied. The radical modification of the spectra of the threshold emission from the quantum dots with increasing cesium coating has been found. Two photoemission channels have been established; they are characterized by considerably different intensities, spectral locations, and widths of the selective bands. It has been shown that the decoration of the quantum dots makes it possible to control the electronic structure and quantum yield of photoemission, the nature of which is related to the excitation of the electronic states of the GaAs substrate and InAs/GaAs quantum dots. Content Type Journal Article Category Condensed Matter Pages 332-335 DOI 10.1134/S0021364012170031 Authors G. V. Benemanskaya, Ioffe Physical Technical Institute, Russian Academy of Sciences, St. Petersburg, 194021 Russia M. N. Lapushkin, Ioffe Physical Technical Institute, Russian Academy of Sciences, St. Petersburg, 194021 Russia V. P. Evtikhiev, Ioffe Physical Technical Institute, Russian Academy of Sciences, St. Petersburg, 194021 Russia A. S. Shkol’nik, Ioffe Physical Technical Institute, Russian Academy of Sciences, St. Petersburg, 194021 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 5

Description:    The mass spectrometry study has indicated that the magnetic field accelerates the oxidation of the surface of silicon crystals. The oxidation rate also depends on the nuclear spin of silicon: the oxidation rate of atoms with magnetic nuclei ( 29 Si) is almost twice as high as that of atoms with spinless, unmagnetized nuclei ( 28 Si and 30 Si). Both effects—magnetic field and magnetic isotope—reliably prove that the oxidation of silicon is a spin-selective reaction involving radicals and radical pairs as intermediate paramagnetic particles. A spin-selective magnetic sensitive oxidation mechanism is discussed. Content Type Journal Article Category Condensed Matter Pages 102-104 DOI 10.1134/S002136401214007X Authors O. V. Koplak, Scientific-Educational Center FKhM, Kyiv University and National Academy of Sciences of Ukraine, Kyiv, 01033 Ukraine R. B. Morgunov, Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia A. L. Buchachenko, Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 2

Description:    An explanation of an anomalously narrow microwave absorption line in superfluid 4 He has been proposed. It has been shown that the experimentally observed resonance linewidth agrees with the assumption of parametric excitation of a macroscopic coherent roton state. Content Type Journal Article Category Condensed Matter Pages 98-98 DOI 10.1134/S0021364012140081 Authors L. A. Melnikovsky, Institute for Physical Problems, Russian Academy of Sciences, ul. Kosygina 2, Moscow, 119334 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 2

Description:    A light emitting diode has been developed on the basis of multilayer nanostructures in which CdSe/CdS semiconductor colloidal quantum dots serve as emitters. Their absorption, photo-, and electroluminescence spectra have been obtained. The strong influence of the size effect and the density of particles in the layer on the spectral and electrophysical characteristics of the diode has been demonstrated. It has been shown that the rates of the transfer of the exciton excitation energy from organic molecules to quantum dots increase strongly even at a small increase in the radius of the core (CdSe) of a particle and depend strongly on the thickness of the shell (CdS) of the particle. The optimal arrangement of the layer of quantum dots with respect to the p-n junction has been estimated from the experimental data. The results demonstrate that the spectral characteristics and rates of the electron processes in light-emitting devices based on quantum dots incorporated into an organic matrix can be efficiently controlled. Content Type Journal Article Category Condensed Matter Pages 113-117 DOI 10.1134/S0021364012140135 Authors A. A. Vashchenko, Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991 Russia V. S. Lebedev, Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991 Russia A. G. Vitukhnovskii, Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991 Russia R. B. Vasiliev, Faculty of Materials Science, Moscow State University, Moscow, 119992 Russia I. G. Samatov, Faculty of Materials Science, Moscow State University, Moscow, 119992 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 2

Description:    The polarization properties of extraordinary microwave transmission through perforated duralumin films are investigated both theoretically and experimentally. It is shown that resonance wavelength at which transmission efficiency reaches maximum value depends on the incident radiation polarization. Content Type Journal Article Category Condensed Matter Pages 99-101 DOI 10.1134/S0021364012140068 Authors S. E. Grigas, Faculty of Physics, Moscow State University, Moscow, 119992 Russia A. G. Rzhanov, Faculty of Physics, Moscow State University, Moscow, 119992 Russia V. N. Semenenko, Institute for Theoretical and Applied Electrodynamics, Russian Academy of Sciences, Moscow, 125412 Russia V. A. Chistyaev, Institute for Theoretical and Applied Electrodynamics, Russian Academy of Sciences, Moscow, 125412 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 2

Description:    We investigate the disturbance of the InAs nanowire resistance by a conductive tip of a scanning probe micro-scope at helium temperature as a function of the tip position in close vicinity to the nanowire. At the tip displacement along the wire the resistance ( R wire ∼ 30 kΩ, what is typical for diffusive regime) demonstrates quasi-periodical oscillations with an amplitude about 3%. The period of the oscillations depends on the number of electrons in the nanowire and is consistent with expected for standing electron waves caused by ballistic electrons in the top subband of the InAs nanowire. Content Type Journal Article Category Condensed Matter Pages 109-112 DOI 10.1134/S0021364012140159 Authors A. A. Zhukov, Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia Ch. Volk, Grünberg Institut (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany A. Winden, Grünberg Institut (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany H. Hardtdegen, Grünberg Institut (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany Th. Schäpers, Grünberg Institut (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 2

Description:    Schramm-Loewner evolution (SLE) and conformal field theory (CFT) are popular and widely used instruments to study critical behavior of two-dimensional models, but they use different objects. While SLE has natural connection with lattice models and is suitable for strict proofs, it lacks computational and predictive power of conformal field theory. To provide a way for the concurrent use of SLE and CFT, CFT correlation functions, which are martingales with respect to SLE, are considered. A relation between parameters of Schramm-Loewner evolution on coset space and algebraic data of coset conformal field theory is revealed. The consistency of this approach with the behavior of parafermionic and minimal models is tested. Coset models are connected with off-critical massive field theories and implications of SLE are discussed. Content Type Journal Article Category Fields, Particles, and Nuclei Pages 90-93 DOI 10.1134/S0021364012140093 Authors A. Nazarov, Department of High-Energy and Elementary Particle Physics, Faculty of Physics and Chebyshev Laboratory, Faculty of Mathematics and Mechanics, St. Petersburg State University, St. Petersburg, 198904 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 2

Description:    Hadron production in lepton-nucleus interactions at high energies is considered in the framework of developing Monte Carlo event generator HARDPING (HARD Probe INteraction Generator). Such effects as formation length, energy loss and multiple rescattering for produced hadrons and their constituents are implemented in the HARDPING 2.0 generator. Available data from HERMES collaboration on hadron production in lepton-nucleus collisions are described by the present version of the HARDPING generator in a reasonable agreement. Content Type Journal Article Category Fields, Particles, and Nuclei Pages 85-89 DOI 10.1134/S0021364012140020 Authors Ya. A. Berdnikov, St.-Petersburg State Polytechnical University, St. Petersburg, 195251 Russia A. E. Ivanov, St.-Petersburg State Polytechnical University, St. Petersburg, 195251 Russia V. T. Kim, St.-Petersburg State Polytechnical University, St. Petersburg, 195251 Russia V. A. Murzin, St. Petersburg Nuclear Physics Institute, Gatchina, 188300 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 2

Description:    A simple description has been proposed for the renormalization of the conduction band parameters in cuprates owing to the interaction of the current carriers with phonons. Kinks in the quasiparticle dispersion law in the optical phonon mode region (70 meV, compound Bi 2 Sr 2 CaCu 2 O 8 − x ) and data on the temperature dependence of the superconducting current density in YBa 2 Cu 3 O 7 have been analyzed. Ideas of new experiments have been discussed. Content Type Journal Article Category Condensed Matter Pages 105-108 DOI 10.1134/S0021364012140044 Authors M. V. Eremin, Institute of Physics, Kazan (Volga Region) Federal University, Kazan, 420008 Russia M. A. Malakhov, Institute of Physics, Kazan (Volga Region) Federal University, Kazan, 420008 Russia D. A. Sunyaev, Institute of Physics, Kazan (Volga Region) Federal University, Kazan, 420008 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 2

Description:    Spectral properties of LiFeAs superconductor are investigated within the LDA+DMFT method. Calculated distribution of the spectral weight in the k -space is in good agreement with angle-resolved photoemission (ARPES) spectra. Calculated effective electron mass enhancement factor m */ m ≈ 3 is close to the one estimated from comparison of density-functional theory results with ARPES spectra. Our results demonstrate that inclusion into consideration of dynamical Coulomb correlations between the electrons plays a key role in understanding of the spectral properties of LiFeAs. Content Type Journal Article Category Condensed Matter Pages 118-122 DOI 10.1134/S0021364012140111 Authors S. L. Skornyakov, Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620990 Russia D. Y. Novoselov, Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620990 Russia T. Gürel, Department of Physics, Namik Kemal University, 59030 Tekirdag, Turkey V. I. Anisimov, Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620990 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 2

Description:    We predict the insulator-metal-insulator transitions for the temperature and pressure of the lower mantle with the metal layer thickness Δ h ≈ 400 km at the depth of 1400–1800 km. The insulator-metal transition has the Mott-Hubbard origin, while the second transition from metal to insulator results from spin crossover of the Fe 2+ ions from high spin S = 2 to low spin S = 0 state. The conductivity in the metal layer may attain 250 S/m. The depth profile of the conductivity is also suggested. Content Type Journal Article Category Miscellaneous Pages 129-132 DOI 10.1134/S002136401214010X Authors S. G. Ovchinnikov, Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036 Russia T. M. Ovchinnikova, Sukhachev Institute of Forest, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036 Russia P. G. Dyad’kov, Trofimuk Institute of Petroleum-Gas Geology and Geophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia V. V. Plotkin, Trofimuk Institute of Petroleum-Gas Geology and Geophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia K. D. Litasov, Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 2

Description:    Experimental studies of the phase diagram of Bose condensation in a system of spatially indirect dipolar excitons in GaAs/AlGaAs quantum wells are reviewed. The properties of spatially periodic patterns arising in the luminescence of the exciton Bose condensate in a ring-shaped potential trap and the coherence of the condensate luminescence are discussed. Content Type Journal Article Category Scientific Summaries Pages 138-147 DOI 10.1134/S0021364012140056 Authors A. V. Gorbunov, Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia V. B. Timofeev, Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 2

Description:    Photoemission induced by vacuum ultraviolet resonance radiation of xenon atoms from the surface of a solid in vacuum and in the case of a target in contact with a gas has been experimentally studied. It has been demonstrated that the photoemission response increases strongly (up to an order of magnitude) under the adsorption (or implantation) of gas atoms into the target when vacuum ultraviolet radiation resonantly acts on these atoms. This is due to different mechanisms of photoemission from the surface of the solid in vacuum and from the surface in contact with the gas. The notion of activated resonant photoemission has been introduced. Content Type Journal Article Category Miscellaneous Pages 133-137 DOI 10.1134/S0021364012140032 Authors P. A. Bokhan, Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, pr. akademika Lavrent’eva 13, Novosibirsk, 630090 Russia D. E. Zakrevsky, Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, pr. akademika Lavrent’eva 13, Novosibirsk, 630090 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 2

Description:    The nature of the set of free fields that represent the system at the critical point has been revealed by studying the correlation functions of the degrees of freedom of the gauge supersymmetric Ising model on the cubic lattice. The same set of free fields represents the continuous supersymmetric Abelian gauge theory. Thus, the name of the lattice system is appropriate. Comparison with the two-dimensional Ising model is given. Content Type Journal Article Category Methods of Theoretical Physics Pages 123-128 DOI 10.1134/S0021364012140147 Authors S. N. Vergeles, Landau Institute for Theoretical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 2

Description:    The possibility of the generation of quasi-cw terahertz radiation by the optical rectification method for broad-band Fourier unlimited nanosecond laser pulses has been experimentally demonstrated. The broadband radiation of a LiF dye-center laser is used as a pump source of a nonlinear optical oscillator. The energy efficiency of terahertz optical frequency conversion in a periodically polarized lithium niobate crystal is 4 × 10 −9 at a pump power density of 7 MW/cm 2 . Content Type Journal Article Category Astrophysics and Cosmology Pages 94-97 DOI 10.1134/S0021364012140123 Authors A. N. Tuchak, Moscow State University, Moscow, 119991 Russia G. N. Gol’tsman, Moscow State Pedagogical University, ul. Malaya Pirogovskaya 1, Moscow, 119991 Russia G. Kh. Kitaeva, Moscow State University, Moscow, 119991 Russia A. N. Penin, Moscow State University, Moscow, 119991 Russia S. V. Seliverstov, Moscow State Pedagogical University, ul. Malaya Pirogovskaya 1, Moscow, 119991 Russia M. I. Finkel, Moscow State Pedagogical University, ul. Malaya Pirogovskaya 1, Moscow, 119991 Russia A. V. Shepelev, Gubkin State University of Oil and Gas, Leninskii pr. 65, Moscow, 119991 Russia P. V. Yakunin, Moscow State University, Moscow, 119991 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 2

Description:    The metal-insulator transition for the square, simple cubic, and body centered cubic lattices has been studied within the Hubbard model at half-filling taking into account nearest- and next-nearest-neighbor electron hopping. Both staggered antiferromagnetic and incommensurate magnetic states (spin-spiral wave) have been considered. The inclusion of the latter states for the three-dimensional lattices does not change the general pattern of the metal-insulator transition, but opens the fundamentally new possibility of the metal-insulator transition of the first order between the magnetically ordered states for the square lattice. Content Type Journal Article Category Condensed Matter Pages 171-175 DOI 10.1134/S002136401215012X Authors M. A. Timirgazin, Physical-Technical Institute, Ural Branch, Russian Academy of Sciences, Izhevsk, 426000 Russia A. K. Arzhnikov, Physical-Technical Institute, Ural Branch, Russian Academy of Sciences, Izhevsk, 426000 Russia V. Yu. Irkhin, Physical-Technical Institute, Ural Branch, Russian Academy of Sciences, Izhevsk, 426000 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 3

Description:    Precision measurements of the real and imaginary parts of the microwave surface impedance Z ac ( T ) = R ac ( T ) + iX ac ( T ) of the conducting ac layers of the k -(BEDT-TTF) 2 Cu[N(CN) 2 ]Br crystals in the temperature interval of 0.5 〈 T 〈 100 K have demonstrated a series of features: (i) the temperature course of the field penetration depth is close to linear Δλ ac ( T )∞Δ X ac ( T ) in the superconducting state at T T c ∼ 11.5 K; (ii) the curves R ac ( T ) = X ac ( T ) coincide at T c 〈 T 〈 40 K; (iii) the X ac ( T ) value at T 〉 40 K increases in comparison with R ac ( T ); (iv) the dependence R ac ( T ) at T 〉 40 K is nonmonotonic in thin crystals. These features of the impedance Z ac ( T ) with increasing T are interpreted in terms of (i) the d -type symmetry of the superconducting order parameter, (ii) normal skin effect, (iii) manifestations of the antiferromagnetic fluctuations, and (iv) the size effect. The electrodynamic parameters of k -(BEDT-TTF) 2 Cu[N(CN) 2 ]Br have been determined. Content Type Journal Article Category Condensed Matter Pages 184-187 DOI 10.1134/S0021364012150088 Authors N. V. Perunov, Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia A. F. Shevchun, Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia N. D. Kushch, Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia M. R. Trunin, Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 3

Description:    The experimental conditions that facilitate the excitation of parametric decay instabilities upon the electron cyclotron resonance heating of a plasma at the second harmonic extraordinary wave in tokamaks and stellarators and, as a result, make anomalous absorption of microwave power possible have been analyzed. It has been shown that, in the case of a nonmonotonic radial profile of the plasma density, when the beam of electron cyclotron waves passes near the equatorial plane of a toroidal device, the parametric excitation of electron Bernstein waves, as well as the generation of ion Bernstein waves propagating from the parametric decay region to the nearest ion cyclotron harmonic, where they efficiently interact with ions, is possible. The proposed theoretical model can explain the anomalous generation of accelerated ions observed upon electron cyclotron heating in small and moderate toroidal facilities. Content Type Journal Article Category Plasma, Hydro- and Gas Dynamics Pages 164-170 DOI 10.1134/S002136401215009X Authors A. Yu. Popov, Ioffe Physical Technical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021 Russia E. Z. Gusakov, Ioffe Physical Technical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021 Russia A. N. Saveliev, Ioffe Physical Technical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 3

Description:    The connection of short-term neutron bursts near sea level with the electric and geomagnetic atmospheric fields during thunderstorms in 2009–2011 has been experimentally studied. The data from the cosmic-ray spectrograph named after Kuzmin, an electrostatic fluxmeter, and a three-component fluxgate magnetometer in Yakutsk have been analyzed. It has been shown that short-term (no longer than 4 min) neutron bursts are due to negative lightning discharges. The bursts are detected at the ground level 1–3 km below thunderstorm clouds. In this case, the neutron flux is about 4 × 10 −3 cm −2 s −1 . The minimum energy of the neutrons that are efficiently detected by the monitor is about 10 MeV. It has been found that short-term neutron bursts are detected when the electric field strength reaches a threshold value of −16 kV/m. Content Type Journal Article Category Miscellaneous Pages 188-191 DOI 10.1134/S0021364012150106 Authors S. A. Starodubtsev, Shafer Institute of Cosmophysical Research and Aeronomy, Siberian Branch, Russian Academy of Sciences, Yakutsk, 677980 Russia V. I. Kozlov, Shafer Institute of Cosmophysical Research and Aeronomy, Siberian Branch, Russian Academy of Sciences, Yakutsk, 677980 Russia A. A. Toropov, Shafer Institute of Cosmophysical Research and Aeronomy, Siberian Branch, Russian Academy of Sciences, Yakutsk, 677980 Russia V. A. Mullayarov, Shafer Institute of Cosmophysical Research and Aeronomy, Siberian Branch, Russian Academy of Sciences, Yakutsk, 677980 Russia V. G. Grigor’ev, Shafer Institute of Cosmophysical Research and Aeronomy, Siberian Branch, Russian Academy of Sciences, Yakutsk, 677980 Russia A. V. Moiseev, Shafer Institute of Cosmophysical Research and Aeronomy, Siberian Branch, Russian Academy of Sciences, Yakutsk, 677980 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 3

Description:    We have derived the so-called gap equation, which determines the upper critical magnetic field, perpendicular to conducting chains of a quasi-one-dimensional superconductor. By analyzing this equation at low temperatures, we have found that the calculated angular dependence of the upper critical magnetic field is qualitatively different than that in the so-called effective mass model. In particular, our theory predicts a non-analytical angular dependence of the upper critical magnetic field, H c 2 (0) − H c 2 (α) ∼ α 3/2 , when magnetic field is close to some special crystallographic axis and makes an angle α with it. We discuss possible experiments on the superconductor (DMET) 2 I 3 to discover this non-analytical dependence. Content Type Journal Article Category Condensed Matter Pages 176-180 DOI 10.1134/S0021364012150052 Authors A. G. Lebed, Department of Physics, University of Arizona, AZ 85721, Tucson, USA O. Sepper, Department of Physics, University of Arizona, AZ 85721, Tucson, USA Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 3

Description:    In our tunneling investigation using Andreev superconductor-normal metal-superconductor contacts on LiFeAs single crystals we observed two reproducible independent subharmonic gap structures at dynamic conductance characteristics. From these results, we can derive the energy of the large superconducting gap Δ L = (2.5–3.4) meV and the small gap Δ S = (0.9–1) meV at T = 4.2 K for the T C local ≈ (10.5–14) K (the contact area critical temperature which deviation causes the variation of Δ L ). The BCS-ratio is found to be 2Δ L / k B T C = 4.6–5.6, whereas 2Δ S / k B T C ≪ 3.52 results from induced superconductivity in the bands with the small gap. Content Type Journal Article Category Condensed Matter Pages 537-543 DOI 10.1134/S0021364012100086 Authors S. A. Kuzmichev, Moscow State University, Moscow, 119991 Russia T. E. Shanygina, Moscow State University, Moscow, 119991 Russia I. V. Morozov, Moscow State University, Moscow, 119991 Russia A. I. Boltalin, Moscow State University, Moscow, 119991 Russia M. V. Roslova, Moscow State University, Moscow, 119991 Russia S. Wurmehl, IFW-Dresden, Institute for Solid State Research, D-01171 Dresden, Germany B. Büchner, IFW-Dresden, Institute for Solid State Research, D-01171 Dresden, Germany Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 10

Description:    It has been shown that counterpropagating electromagnetic waves with different frequencies generate two lattices in a cubically nonlinear medium, one of which moves at a superluminal velocity. When weak radiation reflects from the superluminal lattice, the wavefront is quasi-conjugated with distortions owing to the Doppler frequency shift. These effects occur both in insulators with fast nonlinearity and in an electron-positron vacuum. Content Type Journal Article Category Optics and Laser Physics Pages 609-612 DOI 10.1134/S0021364012120132 Authors N. N. Rosanov, Vavilov State Optical Institute, Birzhevaya liniya 12, St. Petersburg, 199034 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 12

Description:    The dispersion relations of a surface plasmon are determined for the case where two- and three-dimensional plasmas coexist, which is typical of topological insulators. Local plasma modes originating from two- and one-dimensional defects in multilayer superlattices and quantum-wire superlattices are investigated. Content Type Journal Article Category Plasma, Hydro- and Gas Dynamics Pages 637-640 DOI 10.1134/S002136401212003X Authors A. V. Chaplik, Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 12

Description:    The electronic structure of disordered nonstoichiometric titanium monoxide TiO y depending on the oxygen content has been studied by the supercell method in the DFT-GGA approximation with the use of pseudo-potentials. An increase in the oxygen content in TiO y leads to a decrease in the electron density of states near the Fermi level. The calculation of the enthalpy of formation of the ordered and disordered phases has shown that the disordered phase TiO y is more energetically favorable than the phase without the TiO structural vacancies but is less favorable than the ordered Ti 5 O 5 phase. The stability of the disordered phase increases with the oxygen content. Content Type Journal Article Category Condensed Matter Pages 647-651 DOI 10.1134/S0021364012120089 Authors M. G. Kostenko, Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620990 Russia A. V. Lukoyanov, Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620990 Russia V. P. Zhukov, Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620990 Russia A. A. Rempel, Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620990 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 12

Description:    Relations determining the contribution of the inverse flexoelectric effect to the photorefractive response have been determined for the case of the interaction of a steady pump wave conserving left-hand circular polarization with a phase-modulated signal wave that has circular polarization of the opposite sign on the input face of a crystal that has the (100) orientation and symmetry group 23. The experimental studies of such an interaction in a Bi 12 TiO 2 0:Fe,Cu crystal make it possible to estimate its flexoelectric coefficient as f 11 = 5.3 nC/m. Content Type Journal Article Category Optics and Laser Physics Pages 618-621 DOI 10.1134/S0021364012120144 Authors S. M. Shandarov, Tomsk State University of Control Systems and Radioelectronics, pr. Lenina 40, Tomsk, 634050 Russia S. S. Shmakov, Tomsk State University of Control Systems and Radioelectronics, pr. Lenina 40, Tomsk, 634050 Russia N. I. Burimov, Tomsk State University of Control Systems and Radioelectronics, pr. Lenina 40, Tomsk, 634050 Russia O. S. Syuvaeva, Tomsk State University of Control Systems and Radioelectronics, pr. Lenina 40, Tomsk, 634050 Russia Yu. F. Kargin, Tomsk State University of Control Systems and Radioelectronics, pr. Lenina 40, Tomsk, 634050 Russia V. M. Petrov, Tomsk State University of Control Systems and Radioelectronics, pr. Lenina 40, Tomsk, 634050 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 12

Description:    The electronic structure of titanium monoxide TiO y (0.810 ≤ y ≤ 1.262) in the high-temperature cubic phase with vacancies randomly distributed over the titanium and oxygen sublattices is calculated in the coherent potential approximation. The changes in the electronic spectra with the concentration of vacancies are retraced. The calculated spectra are compared to the available experimental data. Content Type Journal Article Category Condensed Matter Pages 641-646 DOI 10.1134/S0021364012120077 Authors M. A. Korotin, Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, ul. S. Kovalevskoi 18, Yekaterinburg, 620990 Russia A. V. Efremov, Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, ul. S. Kovalevskoi 18, Yekaterinburg, 620990 Russia E. Z. Kurmaev, Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, ul. S. Kovalevskoi 18, Yekaterinburg, 620990 Russia A. Moewes, Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, SK S7N 5E2, Canada Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 12

Description:    The generation of a quasistationary magnetic field in a plasma interacting with a weakly focused low-intensity short laser pulse has been studied. It has been shown that the magnetic field changes direction at times comparable with the free path time of effective electrons. Generation also occurs after the switching off of the short pulse and the maximum field is proportional to the duration of the pulse and is reached at times larger than the free path time of the suprathermal electrons. Content Type Journal Article Category Plasma, Hydro- and Gas Dynamics Pages 626-630 DOI 10.1134/S0021364012120065 Authors V. E. Grishkov, Lebedev Physical Institute, Russian Academy of Sciences, Leninskii pr. 53, Moscow, 119991 Russia S. A. Uryupin, Lebedev Physical Institute, Russian Academy of Sciences, Leninskii pr. 53, Moscow, 119991 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 12

Description:    Spatially resolved images of an individual C 60 F 36 fluorofullerene molecules on Si(111)-7 × 7 surface have been obtained by means of scanning tunneling microscopy/spectroscopy (STM/STS). The presence of isomers with different symmetry ( T , C 3 , C 1 ) has been revealed in STM investigation of initial adsorption stage of C 60 F 36 on silicon surface Si(111)-(7 × 7). The adsorbed fluorofullerene molecule can occupy any adsorption site of silicon surface (corner site, faulted half, unfaulted half) that indicates for strong molecule-substrate interaction. The HOMO-LUMO gap of the adsorbed C 60 F 36 molecules have been estimated from current image tunneling spectroscopy (CITS) and z ( V ) with engaged feedback measurements. The value of HOMO-LUMO gap observed experimentally was 3 eV. The C 60 F 36 molecules adsorption on Si(111)-(7 × 7) surface was stable and kept equilibrium configuration during several hours. Content Type Journal Article Category Condensed Matter Pages 666-669 DOI 10.1134/S0021364012120119 Authors A. I. Oreshkin, Department of Physics, Moscow State University, Moscow, 119991 Russia R. Z. Bakhtizin, Department of Physical Electronics, Bashkir State University, Ufa, 450074 Russia V. N. Mantsevich, Department of Physics, Moscow State University, Moscow, 119991 Russia S. I. Oreshkin, Department of Physics, Moscow State University, Moscow, 119991 Russia S. V. Savinov, Department of Physics, Moscow State University, Moscow, 119991 Russia V. I. Panov, Department of Physics, Moscow State University, Moscow, 119991 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 12

Description:    An approach is developed for the description and analysis of sequential dynamics of excitatory neural networks. It is based on the reduction of dynamics of networks to the dynamics of cellular automata on the graph of connections. We apply our approach to network of Hodgkin-Huxley neurons coupled by chemical synapses. Content Type Journal Article Category Biophysics Pages 492-496 DOI 10.1134/S0021364012090093 Authors V. I. Nekorkin, Institute of Applied Physics, Russian Academy of Sciences, Nizhni Novgorod, 603950 Russia A. S. Dmitrichev, Institute of Applied Physics, Russian Academy of Sciences, Nizhni Novgorod, 603950 Russia D. V. Kasatkin, Institute of Applied Physics, Russian Academy of Sciences, Nizhni Novgorod, 603950 Russia V. S. Afraimovich, Instituto de Investigacion en Comunicacion Optica, Universidad Autonoma de San Luis Potosi, Lomas 4a 78220, San Luis Potosi, S.L.P., Mexico Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 9

Description:    Ab initio study of oriented carbon films consisting of bent carbon chains closely packed into a hexagonal cell has been reported. A new structural model of films has been presented. It has been shown that hydrogen impurity is necessary for the stabilization of their structure. Interatomic distances in the film both between chains and along them, as well as the bending angle of carbon chains, have been determined. It has been shown that carbon atoms in the chains have a polyene bond. The distances between chains (5.0 Å) theoretically determined in this work are in excellent agreement with the previously reported experimental data. The analysis of the electronic density of states shows that these films have the dielectric properties with a band gap of about 0.43 eV. The distribution of the charge density along the chains in the film has been studied, which makes it possible to propose a model of the structural instability of such films. Content Type Journal Article Category Condensed Matter Pages 462-466 DOI 10.1134/S002136401209007X Authors Yu. G. Korobova, Faculty of Physics, Moscow State University, Moscow, 119991 Russia D. I. Bazhanov, Faculty of Physics, Moscow State University, Moscow, 119991 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 9

Description:    The low energy effective field model for the multilayer graphene (at ABC stacking) in external Electric field is considered. The Schwinger pair creation rate and the vacuum persistence probability are calculated using the semiclassical approach. Content Type Journal Article Category Condensed Matter Pages 476-480 DOI 10.1134/S0021364012090135 Authors M. A. Zubkov, Alikhanov Institute for Theoretical and Experimental Physics, Moscow, 117259 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 9

Description:    By means of electron-nuclear double resonance (ENDOR), it is shown that the Al impurity, which acts as a shallow donor in ZnO, leads to a significant reduction of the electric field gradient in ZnO single crystals. In ZnO quantum dots, however, the gradient on the Al sites remains virtually unchanged. When the Zn 2+ ion is substituted by Mn 2+ in a ZnO single crystal, the electric field gradient slightly increases (by about 20%). Therefore, the Mn 2+ ions can be used as probes to monitor the electric field gradients in ZnO crystals. Content Type Journal Article Category Condensed Matter Pages 471-475 DOI 10.1134/S0021364012090081 Authors Yu. S. Kutin, Kazan Federal University, Kazan, 420008 Russia G. V. Mamin, Kazan Federal University, Kazan, 420008 Russia S. B. Orlinskii, Kazan Federal University, Kazan, 420008 Russia A. P. Bundakova, Ioffe Physical Technical Institute, Russian Academy of Sciences, St. Petersburg, 194021 Russia P. G. Baranov, Ioffe Physical Technical Institute, Russian Academy of Sciences, St. Petersburg, 194021 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 9

Description:    The problem of the superconductivity of σ electrons in compounds with a honeycomb structure has been analyzed. The equations of superconductivity and the phase diagram have been obtained under the assumption that the Hubbard energy is the largest energy parameter. Content Type Journal Article Category Condensed Matter Pages 380-385 DOI 10.1134/S0021364012070107 Authors R. O. Zaitsev, Moscow Institute of Physics and Technology, Dolgoprudnyi, Moscow region, 141700 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 7

Description:    Stationary and transient photoluminescence of CdS quantum dots deposited on silicon substrates and carbon nanotubes is investigated. The photoluminescence spectrum of quantum dots on a silicon substrate is dominated by a band originating from electron transitions between the quantum-confinement levels in the dots. When the quantum dots are deposited on carbon nanotubes, the intensity of this band decreases significantly. Furthermore, the kinetics of the photoluminescence decay becomes faster, which brings evidence of an additional channel for the quantum-dot deexcitation. The analysis of the experimental data demonstrates that the Förster energy transfer from CdS quantum dots to carbon nanotubes is most probably responsible for this channel. The efficiency of this process exceeds 60%. Content Type Journal Article Category Condensed Matter Pages 362-365 DOI 10.1134/S0021364012070119 Authors A. A. Zarubanov, Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia K. S. Zhuravlev, Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia T. A. Duda, Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia A. V. Okotrub, Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 7

Description:    Three-dimensional photonic crystals with an inverted yablonovite structure have been fabricated by the direct laser writing method based on the two-photon polymerization of a photosensitive material. The correspondence of the structure of the samples to the inverted yablonovite lattice has been confirmed by scanning electron microscopy. The photonic band structure of inverted yablonovite, as well as a number of related photonic materials with an fcc lattice, has been calculated. It has been found that the photonic properties of opal and yablonovite are opposite: the complete photonic band gap appears in inverted opal and direct yablonovite and is absent in direct opal and inverted yablonovite. A method for the fabrication of ideal three-dimensional photonic structures having the complete photonic band gap in the infrared and visible spectral ranges has been discussed. Content Type Journal Article Category Condensed Matter Pages 457-461 DOI 10.1134/S0021364012090123 Authors I. I. Shishkin, National Research University of Information Technologies, Mechanics, and Optics, ul. Sablinskaya 14, St. Petersburg, 197101 Russia K. B. Samusev, National Research University of Information Technologies, Mechanics, and Optics, ul. Sablinskaya 14, St. Petersburg, 197101 Russia M. V. Rybin, National Research University of Information Technologies, Mechanics, and Optics, ul. Sablinskaya 14, St. Petersburg, 197101 Russia M. F. Limonov, National Research University of Information Technologies, Mechanics, and Optics, ul. Sablinskaya 14, St. Petersburg, 197101 Russia Yu. S. Kivshar’, National Research University of Information Technologies, Mechanics, and Optics, ul. Sablinskaya 14, St. Petersburg, 197101 Russia A. Gaidukeviciute, Laser Zentrum Hannover e.V., D-30419 Hannover, Germany R. V. Kiyan, Laser Zentrum Hannover e.V., D-30419 Hannover, Germany B. N. Chichkov, Laser Zentrum Hannover e.V., D-30419 Hannover, Germany Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 9

Description:    The energy spectrum of cosmic rays and the fraction of muons with the threshold 1.0secθ GeV in the total number of charged particles in extensive air showers with energy E 0 ≥ 10 17 eV according to Yakutsk array data collected during 35 years of its continuous operation in 1978–2012 have been analyzed. It has been shown that these characteristics are noticeably different in different time periods. Before 1996, the integral intensity of the spectrum at E 0 = 10 17 eV varied near one stable position and then began to increase. It increased by (45 ± 5)% in seven years and, then, began to decrease. This phenomenon was accompanied a similar change in the fraction of muons and was caused by a significant increase in the average weight of the chemical composition of cosmic rays after 1996 as compared to preceding years. Content Type Journal Article Category Astrophysics and Cosmology Pages 439-443 DOI 10.1134/S0021364012090044 Authors A. V. Glushkov, Shafer Institute of Cosmophysical Research and Aeronomy, Siberian Branch, Russian Academy of Sciences, Yakutsk, 677891 Russia M. I. Pravdin, Shafer Institute of Cosmophysical Research and Aeronomy, Siberian Branch, Russian Academy of Sciences, Yakutsk, 677891 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 9

Description:    A nonlinear Schrödinger equation with variable coefficients for surface waves on a large-scale steady nonuniform current has been derived without the assumption of a relative smallness of the velocity of the current. This equation can describe with good accuracy the loss of modulation stability of a wave coming to a counter current, leading to the formation of so-called rogue waves. Some theoretical estimates are compared to the numerical simulation with the exact equations for a two-dimensional potential motion of an ideal fluid with a free boundary over a nonuniform bottom at a nonzero average horizontal velocity. Content Type Journal Article Category Methods of Theoretical Physics Pages 486-491 DOI 10.1134/S002136401209010X Authors V. P. Ruban, Landau Institute for Theoretical Physics, Russian Academy of Sciences, Moscow, 119334 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 9

Description:    Being the simplest element with just one electron and proton the electronic structure of a single Hydrogen atom is known exactly. However, this does not hold for the complex interplay between them in a solid and in particular not at high pressure that is known to alter the crystal as well as the electronic structure and eventually causes solid hydrogen to become metallic. In spite of intense research efforts the experimental realization of metallic hydrogen, as well as the theoretical determination of the crystal structure has remained elusive. Here we present a computational study showing that the distorted hexagonal P6 3 /m structure is the most likely candidate for Phase III of solid hydrogen. We find that the pairing structure is very persistent and insulating over the whole pressure range, which suggests that metallization due to dissociation may precede eventual bandgap closure. Due to the fact that this not only resolve one of major disagreement between theory and experiment, but also excludes the conjectured existence of phonon-driven superconductivity in solid molecular hydrogen, our results involve a complete revision of the zero-temperature phase diagram of Phase III. Content Type Journal Article Category Condensed Matter Pages 449-453 DOI 10.1134/S0021364012090020 Authors S. Azadi, Institute of Physical Chemistry and Center for Computational Sciences, Johannes Gutenberg University Mainz, 55128 Mainz, Germany Th. D. Kühne, Institute of Physical Chemistry and Center for Computational Sciences, Johannes Gutenberg University Mainz, 55128 Mainz, Germany Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 9

Description:    Spontaneous explosive crystallization in a selenium/copper bilayer nanofilm has been experimentally studied. It has been shown that the formation of a microcrack network in the selenium film is a decisive factor for spontaneous explosive crystallization. The microcrack network is an efficient channel for the relaxation of the collected energy of elastic stresses in the selenium film. The relaxation of this energy accelerates crystallization and transfers it to the explosive regime. It has been found that crystalline phases appearing in the products of the reaction after spontaneous explosive crystallization depend on the ratio of the thicknesses of the copper and selenium films. Content Type Journal Article Category Condensed Matter Pages 454-456 DOI 10.1134/S0021364012090068 Authors V. Ya. Kogai, Institute of Mechanics, Ural Branch, Russian Academy of Sciences, ul. T. Baramzinoy 34, Izhevsk, 426067 Russia A. V. Vakhrushev, Institute of Mechanics, Ural Branch, Russian Academy of Sciences, ul. T. Baramzinoy 34, Izhevsk, 426067 Russia A. Yu. Fedotov, Institute of Mechanics, Ural Branch, Russian Academy of Sciences, ul. T. Baramzinoy 34, Izhevsk, 426067 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 9

Description:    Propagation of elliptically polarized light pulses in a medium of two-level atoms with degenerate energy levels under coherent population trapping has been studied within the density-matrix formalism and reduced Maxwell’s equation. It has been shown that ellipticity pulses and the orientation angle of the polarization ellipse move with a deceleration. The analytical expression for the group velocity of an arbitrary J → J dark transition ( J is an integer) has been derived. In addition, a previously unknown effect of forced phase modulation under the variation of the spatial orientation of the polarization ellipse has been discovered. This phase modulation includes a pilot pulse passing through the medium at the speed of light in vacuum and a slow pulse moving synchronously with the pulse of the orientation angle. Content Type Journal Article Category Optics and Laser Physics Pages 444-448 DOI 10.1134/S0021364012090032 Authors M. Yu. Basalaev, Novosibirsk State Technical University, Novosibirsk, 630092 Russia D. V. Brazhnikov, Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090 Russia A. S. Zibrov, Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090 Russia A. V. Taichenachev, Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090 Russia A. M. Tumaikin, Institute of Laser Physics, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrent’eva 13/3, Novosibirsk, 630090 Russia V. I. Yudin, Novosibirsk State Technical University, Novosibirsk, 630092 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 9

Description:    The possibility of the study of ferromagnetic correlations caused by d -metal impurities in nonmagnetic matrices is discussed. The polarization and magnetic-nuclear interference obtained by analyzing the small-angle scattering of polarized neutrons in a CuZn(20) alloy with Ni impurity (1 at %) are reported. It has been shown that Ni is clustered in the CuZn matrix with the characteristic correlation radius in the range 100 Å 〈 R c 〈 5000 Å depending on the thermal processing of the samples. The cross correlation function determining magnetic-nuclear interference is satisfactorily approximated by the exponential exp(− r / R c ), where r is the distance. It has been found that the nonmagnetic matrix CuZn(20) with an almost uniform distribution of 1% Ni impurity has metamagnetic properties in the field H ≈ 0.5 T at room temperature. Content Type Journal Article Category Condensed Matter Pages 467-470 DOI 10.1134/S0021364012090111 Authors V. V. Runov, Petersburg Nuclear Physics Institute, National Research Centre Kurchatov Institute, Gatchina, 188300 Russia D. S. Ilyn, Petersburg Nuclear Physics Institute, National Research Centre Kurchatov Institute, Gatchina, 188300 Russia M. K. Runova, Petersburg Nuclear Physics Institute, National Research Centre Kurchatov Institute, Gatchina, 188300 Russia A. K. Radzhabov, Petersburg Nuclear Physics Institute, National Research Centre Kurchatov Institute, Gatchina, 188300 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 9

Description:    The dynamics of excitons and trions in GaAs/AlGaAs heterostructures with shallow quantum wells is studied in time-resolved photoluminescence experiments carried out with different repetition rates of picosecond pump pulses for the cases of intrawell, above-barrier, and“two-color” excitation. It is established that excess charge carriers of one type accumulated in the quantum wells under above-barrier excitation play a key role in the formation and dynamics of the exciton-trion system and determine its composition and kinetic properties. The lifetime of excess charge carriers in the quantum wells, estimated from the experimental data, exceeds 10 μs. Content Type Journal Article Category Condensed Matter Pages 481-485 DOI 10.1134/S0021364012090056 Authors M. V. Kochiev, Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991 Russia V. A. Tsvetkov, Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991 Russia N. N. Sibeldin, Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 9

Description:    The statistics of luminescence from single CdSe/CdS core/shell semiconductor nanocrystals under CW laser excitation at room temperature is experimentally investigated by recording sequences of absolute arrival times of the emitted photons. It is shown that the correlation coefficient for consecutive intervals between the photon-arrival times differs from zero. The correlation persists for photon-arrival intervals separated by two or more photon-detection events, until the time between the two intervals becomes, on average, as long as 180 ms, which corresponds to about 10 3 detected photons. A simulation of the luminescence process supports the conclusion that this correlation is linked to the blinking character of the quantum-dot luminescence. Content Type Journal Article Category Optics and Laser Physics Pages 17-20 DOI 10.1134/S0021364012130139 Authors A. G. Vitukhnovskii, Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991 Russia A. Yu. Pereverzev, Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991 Russia V. V. Fedyanin, Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991 Russia S. A. Ambrozevich, Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991 Russia R. B. Vasiliev, Faculty of Materials Science, Moscow State University, Moscow, 119992 Russia D. N. Dirin, Faculty of Materials Science, Moscow State University, Moscow, 119992 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 1

Description:    A direct experimental observation of the anomalous absorption of neutrons undergoing Laue diffraction in a highly perfect silicon single crystal of size about 200 mm at Bragg angles close to π/2 is reported. It is shown that, in the case of diffraction at the (220) plane, the neutron absorption length may be several meters, which is nearly one order of magnitude longer than the mean absorption length for neutrons of the same wavelength. This circumstance makes it possible to study effects accompanying Laue diffraction at Bragg angles of up to 88° and a crystal size of about 200 mm. Content Type Journal Article Category Fields, Particles, and Nuclei Pages 1-5 DOI 10.1134/S0021364012130127 Authors E. O. Vezhlev, Petersburg Nuclear Physics Institute, Gatchina, 188300 Russia V. V. Voronin, Petersburg Nuclear Physics Institute, Gatchina, 188300 Russia I. A. Kuznetsov, Petersburg Nuclear Physics Institute, Gatchina, 188300 Russia S. Yu. Seminikhin, Petersburg Nuclear Physics Institute, Gatchina, 188300 Russia V. V. Fedorov, Petersburg Nuclear Physics Institute, Gatchina, 188300 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 1

Description:    The effect of multiple Andreev reflections in YBa 2 Cu 3 O 7 − x and Tl 2 Ba 2 Ca 2 Cu 3 O 10 − δ has been studied. Several independent subharmonic gap structures associated with the multigap character of these superconductors have been revealed on the I ( V ) and dI / dV characteristics of Andreev contacts. An additional fine structure has been observed, which can be attributed to the emission of Leggett plasmons. The electromagnetic properties of Josephson junctions at a microcrack in Tl 2 Ba 2 Ca 2 Cu 3 O 10 − δ have been examined. The magnetic-field dependences of the critical current, as well as Fiske geometric resonances, have been studied in the Josephson regime (SIS type). The fundamental frequency of resonances and the Swihart velocity have been determined. Content Type Journal Article Category Condensed Matter Pages 35-39 DOI 10.1134/S0021364012130085 Authors S. V. Kul’bachinskii, Faculty of Physics, Moscow State University, Moscow, 119992 Russia Ya. G. Ponomarev, Faculty of Physics, Moscow State University, Moscow, 119992 Russia L. M. Fisher, All-Russia Electrical Engineering Institute, Moscow, 111250 Russia O. V. Belyaeva, Faculty of Physics, Moscow State University, Moscow, 119992 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 1

Description:    We present the results of ab initio modeling of Ge(111)-(2 × 1) surface in the presence of atomic vacancy in surface bilayer. We showed that simple crystal structure defect affects surface electronic structure to the extent comparable with the influence of doping atom. We demonstrated the strong difference of surface LDOS structure above surface defects of different kind. We have proved that spatial oscillations of LDOS exist around individual surface vacancy in the same tunneling bias range as in case of donor doping atom on Ge(111)-(2 × 1) surface. Content Type Journal Article Category Condensed Matter Pages 31-34 DOI 10.1134/S0021364012130103 Authors S. V. Savinov, Faculty of Physics, Moscow State University, Moscow, 119991 Russia A. I. Oreshkin, Faculty of Physics, Moscow State University, Moscow, 119991 Russia S. I. Oreshkin, Sternberg Astronomical Institute, Moscow State University, Moscow, 119991 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 1

Description:    Results of an X-ray diffraction study as well as magnetic and electrical measurements of the solid-state reactions in Ge/Mn polycrystalline films of an 80/20 atomic composition have been presented. It has been shown that the ferromagnetic Mn 5 Ge 3 phase is formed first on the Ge/Mn interface after annealing at ∼120°C. The further increase in the annealing temperature to 300°C leads to the beginning of the synthesis of the Mn 11 Ge 8 phase, which becomes dominating at 400°C. The existence of new structural transitions in the Mn-Ge system in the region of ∼120 and ∼300°C has been predicted on the basis of the presented results and results obtained earlier when studying solid-state reactions in different film structures. The supposition about the general chemical mechanisms of the synthesis of the Mn 5 Ge 3 and Mn 11 Ge 8 phases during the solid-state reactions in the Ge/Mn films of the 80/20 atomic composition and the phase separation in Ge x Mn 1 − x ( x 〉 0.95) diluted semiconductors has been substantiated. Content Type Journal Article Category Condensed Matter Pages 40-43 DOI 10.1134/S0021364012130097 Authors V. G. Myagkov, Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036 Russia V. S. Zhigalov, Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036 Russia A. A. Matsynin, Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036 Russia L. E. Bykova, Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036 Russia G. V. Bondarenko, Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036 Russia G. N. Bondarenko, Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036 Russia G. S. Patrin, Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036 Russia D. A. Velikanov, Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 1

Description:    The features of near-edge structure around the L 3 -Eu absorption edge are investigated in EuCo 2 P 2 , Pr 1 − x Eu x Co 2 P 2 ( x = 0.2, 0.4), and Nd 0.6 Eu 0.4 Co 2 P 2 by means of resonant inelastic X-ray scattering (RIXS). Europium is shown to be in the intermediate valence state in all compounds. A comparison is made of the values of europium intermediate valence obtained by different methods employing the synchrotron radiation. The correlation between europium valence and the observed changes of magnetic ordering in the systems under investigation is discussed. Content Type Journal Article Category Condensed Matter Pages 44-48 DOI 10.1134/S0021364012130152 Authors A. A. Yaroslavtsev, National Research Nuclear University MEPhI, Moscow, 115409 Russia A. P. Menushenkov, National Research Nuclear University MEPhI, Moscow, 115409 Russia R. V. Chernikov, HASYLAB, DESY, D-22607 Hamburg, Germany W. Caliebe, HASYLAB, DESY, D-22607 Hamburg, Germany I. A. Zaluzhnyy, National Research Nuclear University MEPhI, Moscow, 115409 Russia C. M. Thompson, Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, USA K. Kovnir, Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, USA M. Shatruk, Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, USA Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 1

Description:    The dispersion laws of electromagnetic waves in layered periodic metal-dielectric structures with anisotropic metal layers have been theoretically analyzed. It has been found that the anisotropy of metal layers is responsible for the appearance of additional allowed energy bands for photons. It has been shown that these bands correspond to plasma (Langmuir) waves propagating in anisotropic metal layers of the structure. Conditions under which the directions of group and phase velocities of Langmuir waves coincide or are opposite have been determined. It has been shown that the penetration of the electromagnetic field of Langmuir waves into dielectric layers is exponentially weak and this field is primarily concentrated in metal layers, where it oscillates in the direction perpendicular to the plane of the layers. Content Type Journal Article Category Condensed Matter Pages 49-55 DOI 10.1134/S0021364012130036 Authors A. A. Bogdanov, Ioffe Physical Technical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021 Russia R. A. Suris, Ioffe Physical Technical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 1

Description:    Theoretical investigations of the electronic structure of elastically stressed double Ge quantum dots in Si performed in the six-band kp approximation with the Bir-Pikus Hamiltonian and with the configuration interaction method are reviewed. The existence of the antibonding ground state of holes has been revealed. It has been found that, when quantum dots approach each other, the exchange energy of two-particle states has a minimum at the point of the intersection of bonding and antibonding levels; the singlet and triplet states at this point are degenerate. For the lowest spin singlet, it has been revealed that Coulomb correlations in the motion of two holes are manifested in the localization of the two-particle wavefunction at opposite quantum dots when the distance between the dots increases. It has been shown that the degree of entanglement of the singlet quantum states reaches 50% in the case of the manifestation of such spatial correlations. Content Type Journal Article Category Scientific Summaries Pages 75-83 DOI 10.1134/S0021364012130140 Authors A. I. Yakimov, Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 1

Description:    We obtain analytical five-loop results for the renormalization group β-function of Quantum Electrodynamics with the single lepton in different renormalization schemes. The theoretical consequences of the results obtained are discussed. Content Type Journal Article Category Methods of Theoretical Physics Pages 61-65 DOI 10.1134/S0021364012130073 Authors A. L. Kataev, Institute for Nuclear Research, Russian Academy of Sciences, Moscow, 117312 Russia S. A. Larin, Institute for Nuclear Research, Russian Academy of Sciences, Moscow, 117312 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 1

Description:    Magnetic stabilization of Rydberg atoms and multiparticle complexes in an ultracold plasma placed in a magnetic field owing to the diamagnetic shift similar to the diamagnetic shift in semiconductors has been predicted. Content Type Journal Article Category Plasma, Hydro- and Gas Dynamics Pages 27-30 DOI 10.1134/S0021364012130176 Authors B. B. Zelener, Joint Institute for High Temperatures, Russian Academy of Sciences, Izhorskaya ul. 13/19, Moscow, 127412 Russia B. V. Zelener, Joint Institute for High Temperatures, Russian Academy of Sciences, Izhorskaya ul. 13/19, Moscow, 127412 Russia E. A. Manykin, National Research Nuclear University MEPhI, Kashirskoe sh. 31, Moscow, 115409 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 1

Description:    The Telescope Array Collaboration has observed a cosmic-ray event with estimated primary energy of 1.38 × 10 20 eV whose arrival direction coincides [T. Abu-Zayyad et al. (Telescope Array Collaboration), arXiv:1205.5984], given the angular resolution of 1.5°, with that of an event with estimated primary energy of 1.23 × 10 20 eV observed by the Pierre Auger Observatory. The total number of events with energies 〉10 20 eV published by both experiments is six. I estimate the statistical significance of the doublet, which is rather weak, and point out that the arrival directions of events in the doublet coincide with the Galactic X-ray source Aql X-1. Content Type Journal Article Category Astrophysics and Cosmology Pages 13-16 DOI 10.1134/S0021364012130115 Authors S. V. Troitsky, Institute for Nuclear Research, Russian Academy of Sciences, Moscow, 117312 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 1

Description:    The magnetic and spectral properties of the paramagnetic phase of CoO at ambient and high pressures have been calculated within the LDA+DMFT method combining local density approximation (LDA) with dynamical mean-field theory (DMFT). From our results CoO at ambient pressure is a charge transfer insulator in the high-spin t 2 g 5 e g 2 configuration. The energy gap is continuously decreased, and finally a transition into metallic state occurs with the increase in pressure that is consistent with experimental behavior of electrical resistivity. Notably, the metal-insulator transition in CoO is found to be accompanied by the high-spin to low-spin (HS-LS) transition in agreement with XES data. The metal-insulator transition is orbital selective in the t 2 g states of cobalt only, whereas the e g states become metallic after the spin transition at higher pressures. Content Type Journal Article Category Condensed Matter Pages 56-60 DOI 10.1134/S002136401213005X Authors A. A. Dyachenko, Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620990 Russia A. O. Shorikov, Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620990 Russia A. V. Lukoyanov, Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620990 Russia V. I. Anisimov, Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620990 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 1

Description:    We calculate the double differential distributions and distributions in recoil momenta for the high energy non-relativistic double photoionization of helium atom. We show that the results of recent experiments provide the pioneering experimental manifestation of the quasifree mechanism for the double photoionization which was predicted long ago in our papers. This mechanism provides a surplus in distribution over the recoil momenta at small values of the latter, corresponding to nearly “back-to-back” emission of the photoelectrons. Also, in agreement with previous analysis we demonstrate that this surplus is due to the quadrupole terms of the photon-electron interaction. We present the characteristic angular distribution for the back-to-back electron emission. The confirmation of the quasifree mechanism existence opens a new area for exciting experiments, which are expected to increase our understanding of the electron dynamics and of the bound states structure. Content Type Journal Article Category Miscellaneous Pages 70-74 DOI 10.1134/S0021364012130024 Authors M. Ya. Amusia, The Racah Institute of Physics, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel E. G. Drukarev, The Racah Institute of Physics, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel E. Z. Liverts, The Racah Institute of Physics, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 1

Description:    A self-consistent model of the formation and evolution of dusty plasma structures in the ionosphere has been developed. The effect of the initial distributions of dust particles, as well as condensation and absorption of water molecules by dust particles, on the formation of noctilucent clouds and polar mesosphere summer echoes has been demonstrated. The possibility of the formation of a layered structure of noctilucent clouds has been illustrated. Content Type Journal Article Category Plasma, Hydro- and Gas Dynamics Pages 21-26 DOI 10.1134/S0021364012130048 Authors A. Yu. Dubinskii, Institute of Geosphere Dynamics, Russian Academy of Sciences, Leninskii pr. 38, Moscow, 119334 Russia S. I. Popel, Institute of Geosphere Dynamics, Russian Academy of Sciences, Leninskii pr. 38, Moscow, 119334 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 1

Description:    The questions of how a dipole character of the dependence of the form factors G E and G M on the square of the momentum transfer to a proton, Q 2 , arise and why a violation of this dependence occurs, which was first observed in a JLab polarization experiment, are investigated. The answers to these questions could be obtained owing to the use of the simplest QCD concepts of the proton structure and the results obtained by calculating the matrix elements of the proton current in the case of non-spin-flip and spin-flip transitions for protons in the diagonal spin basis (DSB), where the Little Lorentz group common to the initial and final proton states is realized. In DSB, the form factors G E and G M are determined by the matrix elements J p δ,δ and J p −δ,δ of the proton current in the cases of non-spin-flip and spin-flip transitions for protons. In an arbitrary reference frame, the relations between these matrix elements and the form factors are J p δ,δ ∼ G E and J p −δ,δ Ö   t   G M , where τ = Q 2 /4 m 2 , with m being the proton mass. In considering the problem in question at the quark level, use is made of the model where the proton consists of three pointlike quarks having identical masses and where the respective matrix element of the proton current is the product of three quark-current amplitudes having the form J p δ,δ ∼ 1 and J p −δ,δ ∼ Ö   t   . It is shown that the aforementioned dipole dependence arises if the proton spin flip is due to spin flip for only one of the three quarks. As to violations of this dependence, they are caused by the contributions to J p δ,δ from spin-flip transitions for two quarks or by the contribution to J p −δ,δ from spin-flip transitions for all three quarks constituting the proton. Content Type Journal Article Category Fields, Particles, and Nuclei Pages 6-12 DOI 10.1134/S0021364012130061 Authors M. V. Galynskii, Joint Institute of Power and Nuclear Research Sosny, National Academy of Sciences of Belarus, ul. Akademika Krasina 99, Minsk, 220109 Belarus E. A. Kuraev, Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Moscow region, 141980 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 1

Description:    Rogue waves have been studied in the exact simulation of complete hydrodynamic equations for an ideal fluid with a free surface. The statistical characteristics of rogue waves such as the occurrence intensity, average existence time, and maximum energy dissipation at collapse have been obtained in computer experiments. Content Type Journal Article Category Nonlinear Dynamics Pages 66-69 DOI 10.1134/S0021364012130164 Authors V. E. Zakharov, Novosibirsk State University, Novosibirsk, 630090 Russia R. V. Shamin, Novosibirsk State University, Novosibirsk, 630090 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 96 Journal Issue Volume 96, Number 1

Description:    It has been shown that a traditional approach to the calculation of a Parekh wave (a shear surface acoustic wave propagating along the mechanically free surface of a ferromagnet laterally magnetized by a static external magnetic field) including magnetoelastic interaction and neglecting magnetostriction inadequately describes the spectrum of the wave in the high-frequency range. Content Type Journal Article Category Condensed Matter Pages 652-655 DOI 10.1134/S0021364012120120 Authors O. V. Prikhod’ko, Donetsk Physicotechnical Institute, National Academy of Sciences of Ukraine, Donetsk, 83114 Ukraine O. S. Sukhorukova, Donetsk Physicotechnical Institute, National Academy of Sciences of Ukraine, Donetsk, 83114 Ukraine S. V. Tarasenko, Donetsk Physicotechnical Institute, National Academy of Sciences of Ukraine, Donetsk, 83114 Ukraine V. G. Shavrov, Institute of Radio Engineering and Electronics, Russian Academy of Sciences, ul. Mokhovaya 17/7, Moscow, 125009 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 12

Description:    Polarized negative muons were used to study relaxation mechanisms of shallow acceptors in germanium. In p -type germanium at low temperatures relaxation of the muon spin was observed, indicating that the muonic atom (gallium-like acceptor center) formed via capture of the negative muon by a host atom is in the paramagnetic state and its magnetic moment is relaxing. The relaxation rate of the muon spin was found to depend on temperature and on concentration of gallium impurity. We conclude that to the relaxation of the magnetic moment of the Ga acceptor in Ge there contribute both scattering of phonons and quadrupole interaction between the acceptors. We estimate, for the first time, the hyperfine interaction constant for the gallium acceptor in germanium as 0.11 MHz. Content Type Journal Article Category Condensed Matter Pages 662-665 DOI 10.1134/S0021364012120107 Authors T. N. Mamedov, Joint Institute for Nuclear Research, Dubna, Moscow region, 141980 Russia A. S. Baturin, Moscow Institute of Physics and Technology, Dolgoprudnyi, Moscow region, 141700 Russia V. N. Duginov, Joint Institute for Nuclear Research, Dubna, Moscow region, 141980 Russia K. I. Gritsaj, Joint Institute for Nuclear Research, Dubna, Moscow region, 141980 Russia R. Khasanov, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland A. Maisuradze, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland A. V. Stoykov, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 12

Description:    Double mass differences between nuclei having a magic number of protons (neutrons) and their neighbors differing by one or two protons (neutrons) have been calculated on the basis of a semimicroscopic model that has been proposed recently for the problem of nuclear pairing. A dominant term of the effective nucleonnucleon interaction has been calculated on the basis of the realistic Argonne nucleon-nucleon potential v18. It has been supplemented with a moderately small phenomenological term that contains one universal parameter common to protons and neutrons. Double mass differences have been calculated for proton neighbors of the lead-isotope chain ( Z = 82) and for neutron neighbors of N = 82 isotones. Corrections to the model that are caused by the contribution of low-lying surface vibrations (phonons) have been estimated. Content Type Journal Article Category Fields, Particles, and Nuclei Pages 603-608 DOI 10.1134/S0021364012120053 Authors N. V. Gnezdilov, National Research Centre Kurchatov Institute, pl. Akademika Kurchatova 1, Moscow, 123182 Russia E. E. Saperstein, National Research Centre Kurchatov Institute, pl. Akademika Kurchatova 1, Moscow, 123182 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 12

Description:    A numerical Monte Carlo experiment has been performed simulating the concept of a laboratory experiment on the demonstration of runaway electron breakdown of air at high overvoltages. The pronounced second peak of a picosecond runaway-electron pulse, which was observed in the laboratory experiment and interpreted as runaway electron avalanche initiated by the first peak of the pulse, is very slightly manifested in the numerical experiment. Only the initial stage of runaway electron avalanche can be observed in the laboratory experiment, but the fraction of secondary runaway electrons is too small to significantly affect the development of the breakdown. Content Type Journal Article Category Plasma, Hydro- and Gas Dynamics Pages 631-636 DOI 10.1134/S0021364012120090 Authors I. M. Kutsyk, Russian Federal Nuclear Center VNIIEF, Sarov, Nizhni Novgorod region, 607188 Russia L. P. Babich, Russian Federal Nuclear Center VNIIEF, Sarov, Nizhni Novgorod region, 607188 Russia E. N. Donskoi, Russian Federal Nuclear Center VNIIEF, Sarov, Nizhni Novgorod region, 607188 Russia E. I. Bochkov, Russian Federal Nuclear Center VNIIEF, Sarov, Nizhni Novgorod region, 607188 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 12

Description:    We compute numerical traveling wave solutions to a compact version of the Zakharov equation for unidirectional deep-water waves recently derived by Dyachenko and Zakharov [1]. Furthermore, by means of an accurate Fourier-type spectral scheme we find that solitary waves appear to collide elastically, suggesting the integrability of the Zakharov equation. Content Type Journal Article Category Plasma, Hydro- and Gas Dynamics Pages 622-625 DOI 10.1134/S0021364012120041 Authors F. Fedele, School of Civil and Environmental Engineering and School of Electrical and Computer Engineering, Georgia Institute of Technology, GA, 30332 Atlanta, USA D. Dutykh, LAMA UMR 5127 CNRS, Université de Savoie, Campus Scientifique, 73376 Le Bourget-du-Lac Cedex, France Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 12

Description:    We show a method of the organization of charged CdTe nanoparticles which allows the generation of a self-assembled monolayer of above 10.000 μm 2 in a time of about 90 s. The analysis of adsorption kinetics of particles on a surface shows that it is well described by the Langmuir isotherm. We have found that thermal and electrical conductivity of a substrate play an important role. Nevertheless, deficiency of a substrate does not affect the adsorption kinetic. The structure of a formed monolayer essentially depends on pH and, as a consequence, on the charge of the particles. This method can be effective for the production of a CdTe nanoparticle monolayer with well controlled area and a degree of filling on a surface. Content Type Journal Article Category Condensed Matter Pages 656-661 DOI 10.1134/S0021364012120168 Authors D. N. Voylov, Joint Analytical Center, Scientific Center in Chernogolovka, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia L. M. Nikolenko, Joint Analytical Center, Scientific Center in Chernogolovka, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia D. Yu. Nikolenko, Laboratory of Photonics of Nanosized Structures, Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia N. A. Voylova, Joint Analytical Center, Scientific Center in Chernogolovka, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia E. M. Olsen, Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA V. F. Razumov, Joint Analytical Center, Scientific Center in Chernogolovka, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 12

Description:    In the dissipative range at frequencies above the inertial frequency range, the turbulent cascade of capillary waves on the surface of liquid helium and hydrogen decays according to an exponential law. The characteristic frequency of the quasi-Planck distribution is determined by the spectral characteristic of an exciting force. In the case of harmonic pumping on the surface of superfluid helium in the discrete turbulence regime, energy condensation is observed near the high-frequency edge of the inertial range. The effect is due to the influence of discreteness in the spectrum of the eigenfrequencies of surface excitations and in the turbulence distribution on the energy transfer through the cascade. Content Type Journal Article Category Scientific Summaries Pages 670-679 DOI 10.1134/S0021364012120028 Authors L. V. Abdurakhimov, Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia M. Yu. Brazhnikov, Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia A. A. Levchenko, Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia I. A. Remizov, Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia S. V. Filatov, Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 12

Description:    A new approach to the implementation of electromagnetic metamaterials with tunable nonlinearity in the microwave range has been proposed. The characteristics of a split ring resonator equipped with a varactor diode to ensure a nonlinear response and a photodiode to supply a dc bias voltage depending on the illumination intensity have been examined. It has been shown that an increase in the illumination intensity shifts the resonance response toward lower frequency and an increase in the power of the exciting signal shifts the resonance response toward higher frequency. Content Type Journal Article Category Optics and Laser Physics Pages 613-617 DOI 10.1134/S0021364012120156 Authors A. P. Slobozhanyuk, National Research University of Information Technologies, Mechanics, and Optics, St. Petersburg, 197101 Russia P. V. Kapitanova, National Research University of Information Technologies, Mechanics, and Optics, St. Petersburg, 197101 Russia I. V. Shadrivov, National Research University of Information Technologies, Mechanics, and Optics, St. Petersburg, 197101 Russia P. A. Belov, National Research University of Information Technologies, Mechanics, and Optics, St. Petersburg, 197101 Russia Yu. S. Kivshar, National Research University of Information Technologies, Mechanics, and Optics, St. Petersburg, 197101 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 12

Description:    The nonequilibrium transfer of the energy between electrons of counter-propagating quasi-one-dimensional systems has been perturbatively calculated for edge channels in a two-dimensional system in the integer quantum Hall effect. The processes involving two electrons that are allowed only in the system with disorder have been taken into account. Expressions for the cases of Coulomb scattering and transfer of nonequilibrium phonons have been obtained. The energy transferred per unit time has a quasi-threshold dependence on the degree of nonequilibrium of the hot channel. According to numerical estimates for electrons in GaAs, Coulomb scattering processes dominate in the energy transfer and the expected effect can be experimentally observed. Content Type Journal Article Category Condensed Matter Pages 345-349 DOI 10.1134/S0021364012070077 Authors M. G. Prokudina, Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia V. S. Khrapai, Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 7

Description:    The axio-electric effect in silicon atoms is sought for solar axions appearing owing to bremsstrahlung and the Compton process. Axions are detected using a Si(Li) detector placed in a low-background setup. As a result, a model-independent constraint on the axion-electron coupling constant | g Ae | ≤ 2.2 × 10 −10 has been obtained, which leads to the bounds m A ≤ 7.9 eV and m A ≤ 1.4 eV (at 90% C.L.) for the mass of the axion in the DFSZ and KSVZ models, respectively. Content Type Journal Article Category Astrophysics and Cosmology Pages 339-344 DOI 10.1134/S002136401207003X Authors A. V. Derbin, Petersburg Nuclear Physics Institute, Russian Academy of Sciences, Gatchina, 188300 Russia I. S. Drachnev, Petersburg Nuclear Physics Institute, Russian Academy of Sciences, Gatchina, 188300 Russia A. S. Kayunov, Petersburg Nuclear Physics Institute, Russian Academy of Sciences, Gatchina, 188300 Russia V. N. Muratova, Petersburg Nuclear Physics Institute, Russian Academy of Sciences, Gatchina, 188300 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 7

Description:    The emergence of the self-modulation instability of monochromatic microwave spin waves excited in a periodic magnetic film structure, a magnonic crystal, has been observed. The magnonic crystal was fabricated by chemically etching the surface a single-crystal yttrium-iron garnet film. The self-modulation instability has been observed at the frequencies corresponding to the band gaps of the spin-wave spectrum of the magnonic crystal caused by Bragg resonances. Above a certain threshold value of the input microwave signal, the time profile of the output pulses corresponds to envelope solitons. Content Type Journal Article Category Condensed Matter Pages 357-361 DOI 10.1134/S0021364012070041 Authors A. V. Drozdovskii, St. Petersburg State Electrotechnical University, ul. Popova 5, St. Petersburg, 197376 Russia B. A. Kalinikos, St. Petersburg State Electrotechnical University, ul. Popova 5, St. Petersburg, 197376 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 7

Description:    The properties of Josephson junctions with a barrier made of a PdFe weakly ferromagnetic alloy with an iron content of about 1 at % have been studied. It has been shown that this alloy is a weak ferromagnet with a Curie temperature of 10–15 K in the required thickness range of 30–50 nm. The effect of the domain structure and magnetic prehistory of the ferromagnetic barrier on the critical current of a junction and the form of the Josephson characteristics has been demonstrated. The application of these junctions as magnetic switches has been proposed. Content Type Journal Article Category Condensed Matter Pages 366-371 DOI 10.1134/S0021364012070028 Authors V. V. Bol’ginov, Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia V. S. Stolyarov, Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia D. S. Sobanin, Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia A. L. Karpovich, Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia V. V. Ryazanov, Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 7

Description:    A three-dimensional (3D) reconstruction of the atomic structure of the (100) surface of a 1 T -TiSe 2 layered dichalcogenide crystal has been performed from X-ray photoelectron and Auger electron diffraction data. The diffraction patterns of the emission of Auger electrons of Se( LMM ) selenium and photoelectrons of Ti2 p titanium have been considered as holographic diagrams. Being processed with the scattering pattern extraction algorithm using the maximum entropy method (SPEA-MEM), they provide individual 3 D images of the nearest environment of selenium and titanium atoms in the TiSe 2 lattice. Using reconstructed 3 D images, the positions of 128 atoms in the 2 × 2 × 1.5-nm region of the surface layer of TiSe 2 have been determined. The structure of the surface has a 1 T polytype. Interatomic distances in the layer and van der Waals gap are larger than the respective parameters in the bulk of the crystal. It is assumed that titanium layers in two Se-Ti-Se upper surface structural units are displaced along the [001] axis. The structure of the surface layer can be described by a unit cell of the P 3 space group with the parameters a = 3.85 Å and c = 14.4 Å. Content Type Journal Article Category Condensed Matter Pages 372-379 DOI 10.1134/S0021364012070065 Authors I. I. Ogorodnikov, Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620990 Russia A. S. Vorokh, Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620990 Russia A. N. Titov, Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620990 Russia M. V. Kuznetsov, Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620990 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 7

Description:    The region of the state diagram in which the pressure-induced quantum phase transition occurs with the destruction of the antiferromagnetic ordering and the appearance of the superconductivity has been described within the periodic Anderson model. It has been shown that a microscopically homogeneous coexistence phase of antiferromagnetism and superconductivity is implemented in the vicinity of the critical point, which was experimentally found in the heavy-fermion compound CeRhIn 5 . In this region, the pressure increase is accompanied by the experimentally observed strong growth of the effective fermion mass. Content Type Journal Article Category Condensed Matter Pages 350-356 DOI 10.1134/S0021364012070089 Authors V. V. Val’kov, Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russia A. O. Zlotnikov, Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 7

Description:    Spin-wave resonances have been observed in superlattices arising due to the phase separation and self-organization of charge carriers in Eu 0.8 Ce 0.2 Mn 2 O 5 single crystals. The resonances are found within the 5–80 K temperature range at frequencies close to 30 GHz. Similar resonances with intensities about an order of magnitude lower are also observed in EuMn 2 O 5 . The latter suggests the existence of charge transfer processes between the manganese ions of different valences in EuMn 2 O 5 . Content Type Journal Article Category Condensed Matter Pages 386-390 DOI 10.1134/S0021364012070053 Authors E. I. Golovenchits, Ioffe Physical Technical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021 Russia V. A. Sanina, Ioffe Physical Technical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021 Russia V. G. Zalesskii, Ioffe Physical Technical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 7

Description:    A percolation model has been proposed to explain an insulator-conductor transition in ultrananocrystalline diamond films upon addition of nitrogen to a gas mixture used to synthesize films. An observed jump of the conductivity by 10–12 orders of magnitude is a result of the rearrangement of the structure of films leading to the formation of diamond nanorods in a graphite shell. A nitriding-induced increase in the volume fraction of these nanorods (up to 0.22) has been determined from small-angle X-ray scattering data. Conduction occurs through graphite shells and the percolation threshold corresponds to the volume fraction of conducting nanorods of 0.06. Content Type Journal Article Category Condensed Matter Pages 391-395 DOI 10.1134/S0021364012070090 Authors I. I. Vlasov, Prokhorov General Physics Institute, Russian Academy of Sciences, ul. Vavilova 38, Moscow, 119991 Russia M. V. Kanzyuba, Prokhorov General Physics Institute, Russian Academy of Sciences, ul. Vavilova 38, Moscow, 119991 Russia A. A. Shiryaev, Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071 Russia V. V. Volkov, Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 119333 Russia V. G. Ral’chenko, Prokhorov General Physics Institute, Russian Academy of Sciences, ul. Vavilova 38, Moscow, 119991 Russia V. I. Konov, Prokhorov General Physics Institute, Russian Academy of Sciences, ul. Vavilova 38, Moscow, 119991 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 7

Description:    We developed a self-consistent method for the calculation of spatial current distributions in high- T c grain-boundary junctions. It is found that crystallographic anisotropy of high- T c superconducting electrodes results in the effects, which previously were not taken into account for interpretations of experimental data. Among them is a significant redistribution of electrical currents in superconducting electrodes in the vicinity of a grain boundary. In particular in the case of [100]-tilt bicrystal junctions, this current redistribution results in a substantial focusing to the top or bottom part of a thickness of the grain boundary, depending on “roof”- or “valley”-type of the grain boundary. This redistribution is accompanied by generation of vortex currents around the grain boundary, which leads to self-biasing of grain-boundary junctions by magnetic field nucleated by these vortex currents. It is shown that twinning or variation of geometrical shape of the high- T c electrode may also result in intensive redistribution of electrical currents and nucleation of local magnetic fields inside a high- T c superconducting electrodes. Content Type Journal Article Pages 289-294 DOI 10.1134/S0021364012060069 Authors M. Yu. Kupriyanov, Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, 119991 Russia M. M. Khapaev, Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, 119991 Russia Y. Y. Divin, Peter Gruenberg Institute, Forschungszentrum Juelich, 52425 Juelich, Germany V. N. Gubankov, Kotel’nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Moscow, 125009 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 6

Description:    The propagation of electromagnetic waves in an unmagnetized weakly inhomogeneous cold plasma is examined. We show that the inhomogeneity induces a gauge connection term in wave equation, which gives rise to Berry effects in the dynamics of polarized rays in the post geometric optics approximation. The polarization plane of a plane polarized ray rotates as a result of the geometric Berry phase, which is the Rytov rotation. Also, the Berry curvature causes the optical Hall effect, according to which, rays of left/right circular polarization deflect oppositely to produce a spin current directed across the direction of propagation. Content Type Journal Article Pages 277-281 DOI 10.1134/S0021364012060112 Authors R. Torabi, Physics Department, Tafresh University, 39518-79611 Tafresh, Iran M. Mehrafarin, Physics Department, Amirkabir University of Technology, 15914 Tehran, Iran Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 6

Description:    Results of experiments with liquid 3 He immersed in a new type of aerogel are described. This aerogel consists of Al 2 O 3 · H 2 O strands which are nearly parallel to each other, so we call it as a “nematically ordered” aerogel. At all used pressures a superfluid transition was observed and a superfluid phase diagram was measured. Possible structures of the observed superfluid phases are discussed. Content Type Journal Article Pages 326-331 DOI 10.1134/S0021364012060021 Authors R. Sh. Askhadullin, Leypunsky Institute for Physics and Power Engineering, Obninsk, Kaluga region, 249020 Russia V. V. Dmitriev, Kapitza Institute for Physical Problems, Russian Academy of Sciences, Moscow, 119334 Russia D. A. Krasnikhin, Kapitza Institute for Physical Problems, Russian Academy of Sciences, Moscow, 119334 Russia P. N. Martynov, Leypunsky Institute for Physics and Power Engineering, Obninsk, Kaluga region, 249020 Russia A. A. Osipov, Leypunsky Institute for Physics and Power Engineering, Obninsk, Kaluga region, 249020 Russia A. A. Senin, Kapitza Institute for Physical Problems, Russian Academy of Sciences, Moscow, 119334 Russia A. N. Yudin, Kapitza Institute for Physical Problems, Russian Academy of Sciences, Moscow, 119334 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 6

Description:    A quantum-mechanical model has been developed for describing the thermodynamics of an ensemble of ideal antiferromagnetic nanoparticles in the approximation of slowly relaxing macrospins of magnetic sublattices. This model is the foundation for the further development of the general theory for the magnetic dynamics of antiferromagnetic and ferrimagnetic nanoparticles. Moreover, it already allows a qualitative description of the difference between the thermodynamic properties of nanoparticles of different magnetic natures, including quantum effects, which have been observed for almost fifty years in many experimental Mössbauer absorption spectra of 57Fe nuclei in antiferromagnetic nanoparticles. Content Type Journal Article Pages 295-301 DOI 10.1134/S0021364012060033 Authors M. A. Chuev, Institute of Physics and Technology, Russian Academy of Sciences, Nakhimovskii pr. 34, Moscow, 117218 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 6

Description:    A method has been proposed and successfully implemented for filling the channels of single-walled carbon nanotubes with metallic copper by permeating with an aqueous solution of copper nitrate with subsequent thermal treatment. It has been demonstrated that the introduction of metallic copper into the channels of nanotubes leads to donor doping accompanied both by an increase in the Fermi energy of nanotubes and by the transfer of the electron density from introduced metal nanoparticles to the walls of nanotubes. Content Type Journal Article Pages 314-319 DOI 10.1134/S0021364012060057 Authors M. V. Kharlamova, Faculty of Materials Science, Moscow State University, Moscow, 119234 Russia J. J. Niu, Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, USA Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 6

Description:    The temperature dependence of the concentration of magnetic monopoles in spin ice has been analyzed. It has been shown that magnetic Coulomb interaction between monopoles can lead to a temperature-induced stepwise increase in their concentration by several orders of magnitude. This first-order phase transition is also accompanied by a decrease in the relaxation time by several orders of magnitude and can be considered as the melting of the Coulomb phase of spin ice. The phase diagram, as well as the critical point, has been determined. Content Type Journal Article Pages 302-306 DOI 10.1134/S0021364012060082 Authors I. A. Ryzhkin, Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia A. V. Klyuev, Nizhni Novgorod State University, pr. Gagarina 23, Nizhni Novgorod, 603950 Russia M. I. Ryzhkin, Moscow Institute of Physics and Technology, Institutskii per. 9, Dolgoprudnyi, Moscow region, 141700 Russia I. V. Tsybulin, Moscow Institute of Physics and Technology, Institutskii per. 9, Dolgoprudnyi, Moscow region, 141700 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 6

Description:    Cylindrical and spherical Gardner solitons (GSs) and double layers (DLs) in a two-electron-temperature plasma system (containing cold electrons, hot electrons obeying a Boltzmann distribution, and hot ions obeying a nonthermal distribution) are studied by employing the reductive perturbation method. The modified Gardner equation describing the nonlinear propagation of the electron-acoustic (EA) waves is derived, and its nonplanar GS and DL solutions are numerically analyzed. The parametric regimes for the existence of GSs, which are associated with both positive and negative potential, and DLs which are associated with positive potential, are obtained. The basic features of nonplanar EA GSs, and DLs, which are found to be different from planar ones, are also identified. The implications of our results in space and laboratory plasmas are briefly discussed. Content Type Journal Article Pages 282-288 DOI 10.1134/S0021364012060094 Authors S. T. Shuchy, Department of Physics, Jahangirnagar University, Savar, Dhaka, 1342 Bangladesh A. Mannan, Department of Physics, Jahangirnagar University, Savar, Dhaka, 1342 Bangladesh A. A. Mamun, Department of Physics, Jahangirnagar University, Savar, Dhaka, 1342 Bangladesh Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 6

Description:    We show that narrow optical band pass filters can be created by means of nanoparticles which consist of a dielectric sphere and a metallic shell. The components can be adjusted such that there is a remarkable transparency at the desired wavelength range, while a strong absorption takes place outside of this region. Content Type Journal Article Category Optics and Laser Physics Pages 122-126 DOI 10.1134/S0021364012030095 Authors Y. B. Martynov, Institute of Applied Acoustics, Dubna, Moscow region, 141980 Russia R. G. Nazmitdinov, Departament de Física, Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain I. A. Tanachev, Institute of Applied Acoustics, Dubna, Moscow region, 141980 Russia P. P. Gladyshev, Institute of Applied Acoustics, Dubna, Moscow region, 141980 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 3

Description:    A setup for preparing the Bose-Einstein condensate of rubidium atoms has been built. The condensate consists of 10 5 –10 6 87 Rb atoms in the hyperfine state F g = 2 of the ground electronic state. Three key indications of condensation—a sharp increase in the phase-space density of atoms, the threshold emergence of two fractions in the cloud, and anisotropic expansion of the condensate—have been observed. Content Type Journal Article Category Condensed Matter Pages 132-136 DOI 10.1134/S0021364012030046 Authors P. L. Chapovsky, Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 3

Description:    We consider the effective field theory of a graphene monolayer with the Coulomb interaction between fermions taken into account. The gauge field in momentum space is introduced. The position of the Fermi point coincides with the position of the corresponding monopole. The procedure of extracting such monopoles during lattice simulations is suggested. Content Type Journal Article Category Condensed Matter Pages 152-159 DOI 10.1134/S0021364012030113 Authors M. A. Zubkov, Institute for Theoretical and Experimental Physics, Moscow, 117259 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 3

Description:    The retardation of the recombination of electrons and holes in semiconductors in an applied uniform magnetic field has been predicted. It has been shown that the recombination time in germanium in the temperature range of T = 1–10 K at charge carrier densities of n e = 10 10 −10 14 cm −3 in magnetic fields of B = 3 × 10 2 −3 × 10 4 G can be more than two orders of magnitude larger than that at zero magnetic field. This means that, after creation of nonequilibrium charge carriers by their injection at the p - n junction owing to some radiation sources or fast electron irradiation, the semiconductor retains its conductivity for a much longer time at nonzero applied magnetic field. The effect under study can be used, for example, to detect radiation sources. Content Type Journal Article Category Condensed Matter Pages 148-151 DOI 10.1134/S0021364012030101 Authors B. B. Zelener, Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow, 127412 Russia B. V. Zelener, Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow, 127412 Russia E. A. Manykin, National Research Nuclear University MEPhI, Moscow, 115409 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 3

Description:    An electroded heterostructure consisting of a dye layer sandwiched between two polymer ferroelectric layers is discussed. The dye layer plays a role of the probe of the electric field measured by an electroabsorption technique. Using this new method the electric field in ferroelectric and dielectric layers can be measured separately. When an a.c. voltage is applied to the heterostructure, the electric field in the dye layer increases 2.2 times (up to 0.55 GV/m), whereas the field in the ferroelectric decreases 2 times with respect to the average field in the entire structure. Moreover, the dye layer sandwiched between the ferroelectric layers may stand without breakdown the fields 5–7 times higher than a neat reference dye layer confined between metal electrodes. Therefore, the performance of electro-optical, electromechanical and other field controlled devices may be improved considerably when their functional materials are placed between ferroelectrics layers. Content Type Journal Article Category Condensed Matter Pages 160-163 DOI 10.1134/S0021364012030022 Authors L. M. Blinov, Shubnikov Institute of Crystallography, Russian Academy of Sciences, Moscow, 119333 Russia V. V. Lazarev, Shubnikov Institute of Crystallography, Russian Academy of Sciences, Moscow, 119333 Russia S. G. Yudin, Shubnikov Institute of Crystallography, Russian Academy of Sciences, Moscow, 119333 Russia S. P. Palto, Shubnikov Institute of Crystallography, Russian Academy of Sciences, Moscow, 119333 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 3

Description:    The features of the diffusion of particles under the action of an external periodic force in a crystal lattice have been studied using computer simulation. It has been shown that the temperature dependence of the diffusion coefficients is anomalous. Diffusion can increase with a decrease in the temperature in some temperature intervals. The positions and widths of these intervals depend on the frequency of the external field. It has been found that the diffusion coefficient in the presence of a periodic external field can be more than nine orders of magnitude larger than the usual diffusion coefficient at the same temperature. The physical reasons for this anomaly have been analyzed. Content Type Journal Article Category Condensed Matter Pages 137-142 DOI 10.1134/S0021364012030083 Authors I. G. Marchenko, National Science Center Kharkov Institute of Physics and Technology, ul. Akademicheskaya 1, Kharkov, 61108 Ukraine I. I. Marchenko, National Technical University Kharkov Polytechnic Institute, ul. Frunze 21, Kharkov, 61007 Ukraine Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 3

Description:    Energy loss straggling of fast charged particles colliding with atoms have been considered in the eikonal approximation. The result is represented in the form of the Fano formula with a nonperturbative correction. The known nonperturbative Titeica formula (which is transformed to the Fano formula when perturbation theory is applicable) is obtained only under certain approximations in eikonal calculations. It has been shown that straggling calculated with allowance for nonperturbative effects at large charges of the projectile can be significantly different (by an order of magnitude) from the results obtained by Titeica, Fano, and Bohr. Energy loss straggling of fast highly charged ions on hydrogen and copper atoms have been calculated. The latter results are compared to experimental data. Content Type Journal Article Category Fields, Particles, and Nuclei Pages 115-121 DOI 10.1134/S0021364012030071 Authors D. N. Makarov, Northern (Arctic) Federal University, Arkhangelsk, 163002 Russia V. I. Matveev, Northern (Arctic) Federal University, Arkhangelsk, 163002 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 3

Description:    We demonstrate a manifestation of the charge traveling wave along the c axis (TW) in current voltage characteristics of coupled Josephson junctions in high- T c superconductors. The branches related to the TW with different wavelengths are found for the stacks with different number of Josephson junctions at different values of system’s parameters. Transitions between the TW branches and the outermost branch are observed. The electric charge in the superconducting layers and charge-charge correlation functions for TW and outermost branches show different behavior with bias current. We propose an experimental testing of the TW branching by microwave irradiation. Content Type Journal Article Pages 307-313 DOI 10.1134/S0021364012060100 Authors Yu. M. Shukrinov, Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Moscow region, 141980 Russia M. Hamdipour, Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Moscow region, 141980 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 6

Description:    Molecular dynamics computer simulation has been used to compute in wide pressure-temperature region the self-diffusion coefficient and shear viscosity of soft-sphere fluids, in which the particles interact through the inverse power pair potential. The limitations of the previous empirical approaches and models for the description of the kinetic coefficients are shown. On the basis of the simulations the universal functions for diffusion coefficient and shear viscosity of soft spheres are constructed which allow to compute these quantities for any density and temperature. We show that the behavior of shear viscosity at high temperatures is more complex than the one of diffusion coefficient and give quantitative explanation of this result. Content Type Journal Article Pages 320-325 DOI 10.1134/S0021364012060045 Authors Yu. D. Fomin, Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow region, 142190 Russia V. V. Brazhkin, Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow region, 142190 Russia V. N. Ryzhov, Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow region, 142190 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 6

Description:    A family of quantum key distribution protocols based on geometrically uniform states of laser radiation has been proposed. Their cryptographic strength against a unitary attack, a coherent-state-splitting attack, and an unambiguous measurement attack has been analyzed. A certain protocol can be chosen automatically depending on the parameters of a system and the required length of a communication channel. Content Type Journal Article Pages 332-337 DOI 10.1134/S0021364012060070 Authors S. N. Molotkov, Academy of Cryptography of the Russian Federation, Moscow, 121552 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 6

Description:    A new incommensurate magnetic structure with a locally triangular orientation of spins has been proposed for a two-subsystem magnet with frustrated intersystem exchange and competition between exchanges in one of the subsystems. When the temperature is lowered, this structure appears from the antiferromagnetic state after a first-order phase transition. It transfers to the Yafet-Kittel triangular structure when the threshold conditions for the exchange interactions are fulfilled. An increase in the length of the frustrated exchange bonds leads to the appearance of an incommensurate phase with the local antiferromagnetic orientation of the sublattices in each subsystem between the commensurate antiferromagnetic and Yafet-Kittel phases. Content Type Journal Article Category Condensed Matter Pages 188-192 DOI 10.1134/S0021364012040066 Authors S. N. Martynov, Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 4

Description:    A particular modification of the free-field representation of the form factors in the Bullough-Dodd model is considered. The two-particles minimal form factors are excluded from the construction. As a consequence, a convenient representation for the multiparticle form factors has been obtained, recurrence relations between them have been established, and their properties have been studied. The proposed construction is used to obtain the free-field representation of the lightest particles form factors in the Φ 1, 2 perturbed minimal models. The Ising model in a magnetic field is considered as a significant example. The results obtained in the framework of the proposed free-field representation are in agreement with the corresponding results obtained by solving the bootstrap equations. Content Type Journal Article Category Condensed Matter Pages 201-205 DOI 10.1134/S0021364012040030 Authors O. V. Alekseev, Landau Institute for Theoretical Physics, Russian Academy of Sciences, Moscow, 117940 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 4

Description:    The nonperturbative QCD vacuum at finite temperature and baryon density in an external magnetic field has been studied. Relations between the nonperturbative condensates and the thermodynamic pressure at T ≠ 0, μ q ≠ 0, and H ≠ 0 have been obtained and the low-energy theorems have been derived. Bulk viscosity ζ( T , μ, H ) has been described in terms of the main thermodynamic quantities characterizing the quark-gluon matter at T ≠ 0, μ q ≠ 0, and H ≠ 0. Various limiting cases have been discussed. Content Type Journal Article Category Fields, Particles, and Nuclei Pages 171-175 DOI 10.1134/S0021364012040029 Authors N. O. Agasian, Institute for Theoretical and Experimental Physics, ul. Bol’shaya Cheremushkinskaya 25, Moscow, 117218 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 4

Description:    It has been revealed experimentally that nanocavities remain inside a surface layer of aluminum after action of a femtosecond laser pulse. This result is in agreement with numerical simulation. A detailed picture of melting, formation of expansion and compression waves, and bubble nucleation in the stretched melt has been reconstructed through atomistic simulation. It has been shown that the bubbles do not fully collapse but remain as frozen disk-shaped nanocavities upon recrystallization of the melt. The formation of a porous metal with small voids is very important for understanding the physics of laser exposure and may have significant applications. Content Type Journal Article Category Plasma, Hydro- and Gas Dynamics Pages 176-181 DOI 10.1134/S0021364012040042 Authors S. I. Ashitkov, Joint Institute for High Temperatures, Russian Academy of Sciences, ul. Izhorskaya 13/19, Moscow, 125412 Russia N. A. Inogamov, Landau Institute for Theoretical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia V. V. Zhakhovskii, Department of Physics, University of South Florida, Tampa, FL 33620, USA Yu. N. Emirov, Nanomaterials and Nanomanufacturing Research Center, University of South Florida, Tampa, FL 33620, USA M. B. Agranat, Joint Institute for High Temperatures, Russian Academy of Sciences, ul. Izhorskaya 13/19, Moscow, 125412 Russia I. I. Oleinik, Department of Physics, University of South Florida, Tampa, FL 33620, USA S. I. Anisimov, Landau Institute for Theoretical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia V. E. Fortov, Joint Institute for High Temperatures, Russian Academy of Sciences, ul. Izhorskaya 13/19, Moscow, 125412 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 4

Description:    An orthonormalized basis describing the single-hole states of the CuO 2 plane has been constructed exactly taking into account the p - d exchange coupling between the spins of a hole and the two nearest copper ions. The introduced basis makes it possible to include the effects caused by the dependence of the Heisenberg interaction between the nearest copper ions on the occupation of the intermediate oxygen ion by the hole in the calculation of the spectrum of the collective excitations of nonlocal three-spin polarons. The inclusion of this correlation, as well as the nonlocality of the p - d exchange coupling, is the main difference of the developed approach to the description of the energy structure from the calculations with the use of the Zhang-Rice singlet. Content Type Journal Article Category Condensed Matter Pages 206-212 DOI 10.1134/S0021364012040091 Authors V. V. Val’kov, Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036 Russia D. M. Dzebisashvili, Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036 Russia A. F. Barabanov, Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow region, 142190 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 4

Description:    The dusty plasma system in the surface layer of the illuminated part of the Moon has been considered. The maximum height of the dust rise has been determined. It has been shown that a dead zone, where dust particles cannot rise over the surface of the Moon, is absent near a lunar latitude of 80°. The size and height distributions of dust have been determined. Content Type Journal Article Category Plasma, Hydro- and Gas Dynamics Pages 182-187 DOI 10.1134/S0021364012040054 Authors A. P. Golub’, Institute of Geosphere Dynamics, Russian Academy of Sciences, Leninskii pr. 38, Moscow, 119334 Russia G. G. Dol’nikov, Space Research Institute, Russian Academy of Sciences, ul. Profsoyuznaya 84/32, Moscow, 117997 Russia A. V. Zakharov, Space Research Institute, Russian Academy of Sciences, ul. Profsoyuznaya 84/32, Moscow, 117997 Russia L. M. Zelenyi, Space Research Institute, Russian Academy of Sciences, ul. Profsoyuznaya 84/32, Moscow, 117997 Russia Yu. N. Izvekova, Institute of Geosphere Dynamics, Russian Academy of Sciences, Leninskii pr. 38, Moscow, 119334 Russia S. I. Kopnin, Institute of Geosphere Dynamics, Russian Academy of Sciences, Leninskii pr. 38, Moscow, 119334 Russia S. I. Popel, Institute of Geosphere Dynamics, Russian Academy of Sciences, Leninskii pr. 38, Moscow, 119334 Russia Journal JETP Letters Online ISSN 1090-6487 Print ISSN 0021-3640 Journal Volume Volume 95 Journal Issue Volume 95, Number 4