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The theory of nonequilibrium Anderson impurity model for strongly correlated electron systems (2015)

V. A. Moskalenko, L. A. Dohotaru and D. F. Digor

American Institute of Physics (AIP)

In: Low Temperature Physics

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Publikationsdatum: 2015-05-30

Beschreibung: The nonequilibrium theory of strongly correlated systems is proposed theory which is grounded on the generalized Wick theorem. This theorem is employed for calculation of the thermal averages of the contour arranged products of electron operators by generalizing Keldysh formalism. Perturbation expansion is realized for Anderson impurity model in which we consider the Coulomb interaction of the impurity electrons as a main parameter of the model and the mixing interaction between impurity and conduction electrons as a perturbation. The first two approximations are used and is obtained the value of the current between one of the leads and central region of interacting electrons. The contribution of the strong correlations and of irreducible diagrams is analyzed.

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Digitale ISSN: 1090-6517

Thema: Physik

Publiziert von American Institute of Physics (AIP)

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Spin Nernst effect and intrinsic magnetization in two-dimensional Dirac materials (2015)

V. P. Gusynin, S. G. Sharapov and A. A. Varlamov

American Institute of Physics (AIP)

In: Low Temperature Physics

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Publikationsdatum: 2015-05-30

Beschreibung: We begin with a brief description of the role of the Nernst-Ettingshausen effect in the studies of the high-temperature superconductors and Dirac materials such as graphene. The theoretical analysis of the NE effect is involved because the standard Kubo formalism has to be modified by the presence of magnetization currents in order to satisfy the third law of thermodynamics. A new generation of the low-buckled Dirac materials is expected to have a strong spin Nernst effect that represents the spintronics analog of the NE effect. These Dirac materials can be considered as made of two independent electron subsystems of the two-component gapped Dirac fermions. For each subsystem the gap breaks a time-reversal symmetry and thus plays a role of an effective magnetic field. We explicitly demonstrate how the correct thermoelectric coefficient emerges both by the explicit calculation of the magnetization and by a formal cancelation in the modified Kubo formula. We conclude by showing that the nontrivial dependences of the spin Nersnt signal on the carrier concentration and electric field applied are expected in silicene and other low-buckled Dirac materials.

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Thema: Physik

Publiziert von American Institute of Physics (AIP)

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Electronic and magnetic properties of graphite quantum dots (2015)

Hazem Abdelsalam, T. Espinosa-Ortega and Igor Luk'yanchuk

American Institute of Physics (AIP)

In: Low Temperature Physics

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Publikationsdatum: 2015-05-30

Beschreibung: We study the electronic and magnetic properties of multilayer quantum dots (MQDs) of graphite in the nearest-neighbor approximation of tight-binding model. We calculate the electronic density of states and orbital susceptibility of the system as function of the Fermi level location. We demonstrate that properties of MQD depend strongly on the shape of the system, on the parity of the layer number and on the form of the cluster edge. The special emphasis is given to reveal the new properties with respect to the monolayer graphene quantum dots. The most interesting results are obtained for the triangular MQD with zig-zag edge at near-zero energies. The asymmetrically smeared multipeak feature is observed at Dirac point within the size-quantized energy gap region, where monolayer graphene flakes demonstrate the highly-degenerate zero-energy state. This feature, provided by the edge-localized electronic states results in the splash-wavelet behavior in diamagnetic orbital susceptibility as function of energy.

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Thema: Physik

Publiziert von American Institute of Physics (AIP)

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Vadim Mikhailovich Loktev (For his 70th Birthday) (2015)

American Institute of Physics (AIP)

In: Low Temperature Physics

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Publikationsdatum: 2015-05-30

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Conformal phase transition: QCD like theories with a large number of fermion flavors and all that (2015)

V. A. Miransky

American Institute of Physics (AIP)

In: Low Temperature Physics

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Publikationsdatum: 2015-05-30

Beschreibung: The notion of the conformal phase transiton (CPhT) is discussed. As its realization, the dynamics with an infrared stable fixed point in the conformal window in QCD like theories with a relatively large number of fermion flavors is reviewed. The emphasis is on the description of a clear signature for the conformal window, which in particular can be useful for lattice computer simulations of these gauge theories. A possibility of the relevance of the CPhT in graphene is mentioned.

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Thema: Physik

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Microwave detectors based on the spin-torque diode effect (2015)

O. V. Prokopenko and A. N. Slavin

American Institute of Physics (AIP)

In: Low Temperature Physics

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Publikationsdatum: 2015-05-30

Beschreibung: The spin-transfer torque (STT) effect provides a new method of manipulation of magnetization in nanoscale objects. The STT effect manifests itself as a transfer of spin angular momentum between the parallel magnetic layers separated by a nonmagnetic spacer and traversed by a dc electric current. The transfer of the spin angular momentum from one layer to another could result in the excitation of the microwave-frequency magnetization dynamics in one of the magnetic layers. On the other hand, when a magnetization dynamics is excited in a magnetic layered structure by an external microwave signal both the structure electrical resistance and current through the structure will acquire microwave components resulting in the appearance of a rectified dc voltage on the magnetic structure. This “spin-torque diode effect” can be used for the development of ultra-sensitive spin-torque microwave detectors (STMD). Below we present a brief review of our recent work on the general properties of STMDs, analyze the performance of the “resonance-type” and “threshold-type STMD” and consider the possible applications for such microwave detectors.

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The Higgs effect and the magnetoelastic gap in ferromagnets (2015)

V. G. Baryakhtar and A. G. Danilevich

American Institute of Physics (AIP)

In: Low Temperature Physics

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Publikationsdatum: 2015-05-30

Beschreibung: It is shown that the manifestation of a magnetoelastic gap in a ferromagnet is caused by the same effect that endows the Higgs boson with mass. The “easy plane” state is studied in a uniaxial ferromagnet, taking into account magnetoelastic interaction. The strain tensor components of the ferromagnet in the ground state, magnetoelastic gap, and the renormalization of the magnetic anisotropy constant, are determined.

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Optical absorption and luminescence studies of fast neutron-irradiated complex oxides for jewellery applications (2016)

N. Mironova-Ulmane, V. Skvortsova and A. I. Popov

American Institute of Physics (AIP)

In: Low Temperature Physics

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Publikationsdatum: 2016-07-30

Beschreibung: We studied the optical absorption and luminescence of agate (SiO 2 ), topaz (Al 2 [SiO 4 ](F,OH) 2 ), beryl (Be 3 Al 2 Si 6 O 18 ), and prehnite (Ca 2 Al(AlSi 3 O 10 )(OH) 2 ) doped with different concentrations of transition metal ions and exposed to fast neutron irradiation. The exchange interaction between the impurity ions and the defects arising under neutron irradiation causes additional absorption as well as bands' broadening in the crystals. These experimental results allow us to suggest the method for obtaining new radiation-defect induced jewellery colors of minerals due to neutron irradiation.

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Theoretical analysis of the kinetics of low-temperature defect recombination in alkali halide crystals (2016)

V. N. Kuzovkov, A. I. Popov, E. A. Kotomin, A. M. Moskina, E. Vasilchenko and A. Lushchik

American Institute of Physics (AIP)

In: Low Temperature Physics

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Publikationsdatum: 2016-07-30

Beschreibung: We analyzed carefully the experimental kinetics of the low-temperature diffusion-controlled F, H center recombination in a series of irradiated alkali halides and extracted the migration energies and pre-exponential parameters for the hole H centers. The migration energy for the complementary electronic F centers in NaCl was obtained from the colloid formation kinetics observed above room temperature. The obtained parameters were compared with data available from the literature.

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The specifics of radiative annihilation of self-trapped excitons in a KI–Tl crystal under low-temperature deformation (2016)

K. Sh. Shunkeyev, N. N. Zhanturina, Z. K. Aimaganbetova, A. A. Barmina, L. N. Myasnikova, Sh. Zh. Sagymbaeva and D. M. Sergeyev

American Institute of Physics (AIP)

In: Low Temperature Physics

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Publikationsdatum: 2016-07-30

Beschreibung: The effect of low-temperature uniaxial deformation on the self-trapping-limited mean free path of excitons in a KI–Tl crystal was revealed from x-ray luminescence spectra. The analysis of the dependence of the intensity ratio of the Tl-center emission (2.85 eV) and the luminescence of self-trapped excitons (π-component; 3.3 eV) on the extent of low-temperature deformation showed that in the KI–Tl crystal (3 × 10 −3 mol. %) the self-trapping-limited mean free path of excitons is comparable with the distance between Tl atoms (20–27) a under a deformation ε = 2%. As the compression increases to ε ≥ 2%–5%, the mean free path drops to (27-5.35) a . The results of modeling based on the continuum approximation showed that with increasing temperature and the degree of low-temperature deformation the height of the potential barrier for the exciton self-trapping drops, which is consistent with the reduction of the mean free path of excitons in the KI–Tl crystal.

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