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  • 1
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    Raman scattering study of spin-density-wave-induced anisotropic electronic properties in AFe_{2} As_{2} (A=Ca, Eu) (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-05-06
    Description: Author(s): W.-L. Zhang, Z. P. Yin, A. Ignatov, Z. Bukowski, Janusz Karpinski, Athena S. Sefat, H. Ding, P. Richard, and G. Blumberg We present a polarization-resolved and temperature-dependent Raman scattering study of A Fe 2 As 2 ( A = Ca , Eu). In the spin-density-wave phase, spectral weight redistribution is observed in the fully symmetric and nonsymmetric scattering channels at different energies. An anisotropic Raman response is ob… [Phys. Rev. B 93, 205106] Published Thu May 05, 2016
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Effect of polarization upon light localization in random layered magnetodielectric media (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-06-28
    Description: Author(s): A. I. Ignatov, A. M. Merzlikin, A. P. Vinogradov, and A. A. Lisyansky Light propagation in a random system of isotropic magnetodielectric layers is studied numerically and analytically. It is shown that if the values of permittivity and permeability are randomly distributed, whereas the characteristic impedance does not change throughout the system, the Lyapunov expon... [Phys. Rev. B 83, 224205] Published Mon Jun 27, 2011
    Keywords: Inhomogeneous, disordered, and partially ordered systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Theory of hysteresis during electron heating of electromagnetic wave scattering by self-organized dust structures in complex plasmas (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-07-17
    Description: Dust structuring is a natural and universal process in complex plasmas. The scattering of electromagnetic waves by dust structures is governed by the factor of coherency, i.e., the total number of coherent electrons in a single structure. In the present paper, we consider how the factor of coherency changes due to additional pulse electron heating and show that it obeys a hysteresis. After the end of the pulse heating, the scattering intensity differs substantially from that before heating. There are three necessary conditions for scattering hysteresis: first, the radiation wavelength should be larger than the pattern (structure) size; second, the total number of coherent electrons confined by the structure should be large; and third, the heating pulse duration should be shorter than the characteristic time of dust structure formation. We present the results of numerical calculations using existing models of self-consistent dust structures with either positively or negatively charged dust grains. It is shown that, depending on the grain charge and the ionization rate, two types of hysteresis are possible: one with a final increase of the scattering and the other with a final decrease of the scattering. It is suggested that the hysteresis of coherent scattering can be used as a tool in laboratory experiments and that it can be a basic mechanism explaining the observed hysteresis in radar scattering by noctilucent clouds during active experiments on electron heating in mesosphere.
    Print ISSN: 1070-664X
    Electronic ISSN: 1089-7674
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 4
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    Synchronization of two memristively coupled van der Pol oscillators (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-02-26
    Description: The objective of this letter is to convey two essential principles of biological computing— synchronization and memory —in an electronic circuit with two van der Pol (vdP) oscillators coupled via a memristive device. The coupling was mediated by connecting the gate terminals of two programmable unijunction transistors through a resistance-capacitance network comprising an Ag-TiO x -Al memristive device. In the high resistance state the memristance was in the order of MΩ, which leads to two independent self-sustained oscillators characterized by the different frequencies f 1 and f 2 and no phase relation between the oscillations. Depending on the mediated pulse amplitude, the memristive device switched to the low resistance state after a few cycles and a frequency adaptation and phase locking were observed. The experimental results are underlined by theoretically considering a system of two coupled vdP equations. This experiment may pave the way to larger neuromorphic networks in which the coupling parameters (through memristive devices) can vary in time and strength and are able to remember the history of applied electrical potentials.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 5
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    Semiconductor superlattice diodes for detection of terahertz photons: The role of hybridization of the plasma and polar-optical phonon modes (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-08-27
    Description: The current (voltage) responsivity of a superlattice-based diode detector has been studied theoretically in the terahertz frequency band that includes the region of the polar-optical phonon frequencies. Within the framework of an equivalent circuit approach, the electro-dynamical model which allows one to analyze the responsivity taking into account the hybridization of the plasma and polar-optical phonon modes both in the substrate and in the cladding layers of the diode has been suggested. It has been shown that the presence of the plasma and polar-optical phonon modes gives rise to strong features in the frequency dependence of the responsivity, i.e., to the resonance dips and peaks at frequencies of hybridized plasmons and polar-optical phonons. It has been suggested that by judicious engineering of the superlattice-based diodes, it would be possible to enhance substantially their responsivity in the terahertz frequency band.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 6
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    Structural phase transition below 250 K in superconducting K_{0.75}Fe_{1.75}Se_{2} (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-10-09
    Description: Author(s): A. Ignatov, A. Kumar, P. Lubik, R. H. Yuan, W. T. Guo, N. L. Wang, K. Rabe, and G. Blumberg Vibrational properties of iron-chalcogenide superconductor K 0.75 Fe 1.75 Se 2 with T c  ∼ 30 K have been measured by Raman and optical spectroscopies over the temperature range 3–300 K. The sample undergoes I 4/ m → I 4 structural phase transition accompanied by loss of inversion symmetry at T 1 , below 250 K, o... [Phys. Rev. B 86, 134107] Published Mon Oct 08, 2012
    Keywords: Structure, structural phase transitions, mechanical properties, defects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 7
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    Wood anomalies for s-polarized light incident on a one-dimensional metal grating and their coupling with channel plasmons (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-05-17
    Description: Author(s): A. I. Ignatov, A. M. Merzlikin, and A. V. Baryshev Angular spectra of reflectance of light from one-dimensional periodic gratings of V-shaped grooves in a metal film have been theoretically studied at a fixed wavelength. The exciting light wave was incident in the plane parallel to grooves. For the case of s -polarized incident wave there are two typ… [Phys. Rev. A 95, 053843] Published Tue May 16, 2017
    Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 8
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    Coherent scattering of electromagnetic waves by self-organized dust structures: Degree of coherence (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-02-25
    Description: It is demonstrated explicitly that the scattering of electromagnetic waves by dust structures can be strongly enhanced as compared to incoherent scattering by random electrons. If the size of the dust structure is much less than the wavelength of the incident radiation, the scattering is coherent. In this case, the scattering is proportional to the square of the total number of electrons in the structure. In the opposite limit, the scattering is incoherent being proportional to the total number of electrons in the structure. The factor describing the degree of coherency is calculated numerically for several models of self-organized structures. It is demonstrated in general way that for sudden heating of electrons, the factor of coherency in scattering by structures can decrease by several orders of magnitude with subsequent increase after the heating is switched off. In laboratory dusty plasmas, the coherent scattering is proposed for diagnostics of universal structuring instability and as a probe for determining the properties typical for self-organized nature of structures that are observed in recent experiments.
    Print ISSN: 1070-664X
    Electronic ISSN: 1089-7674
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 9
    Electronic Resource
    Electronic Resource
    Squeezed state of high-current electron beam (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 741-744 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The results of the computer simulation of an electron beam propagating serially through two coaxial tubes with different radii are presented. It is shown that the virtual cathode in this system may be located in one of two positions depending on the injection current, variation of which yields fast movements of the potential barrier. Under certain conditions, a part of the beam may be in its squeezed state, forming, therefore, a cloud of a dense warm plasma. The qualitative analytical theory based on the consideration of the energy and momentum balance is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870819
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  • 10
    Electronic Resource
    Electronic Resource
    Current responsivity of semiconductor superlattice THz-photon detectors (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 3643-3654 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The current responsivity of a semiconductor superlattice THz-photon detector is calculated using an equivalent circuit model which takes into account the finite matching efficiency between a detector antenna and the superlattice in the presence of parasitic losses. Calculations performed for currently available superlattice diodes show that both the magnitudes and the roll-off frequencies of the responsivity are strongly influenced by an excitation of hybrid plasma-Bloch oscillations which are found to be eigenmodes of the system in the THz-frequency band. The expected room temperature values of the responsivity (2–3 A/W in the 1–3 THz-frequency band) range up to several percents of the quantum efficiency e/(h-dash-bar)ω of an ideal superconductor tunnel junction detector. Properly designed semiconductor superlattice detectors may thus demonstrate better room temperature THz-photon responsivity than conventional Schottky junction devices. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369728
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