Imeni Vladimira Il'icha Lenina, Russia
Imeni Vladimira Il'icha Lenina, Russia

The Volgograd State Pedagogical University , is one of the major pedagogical institutions in the Russian Federation. The university is located in Volgograd, formerly known as Stalingrad . Wikipedia.


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Belonenko M.B.,Volgograd State Pedagogical University | Glazov S.Y.,Volgograd State Pedagogical University | Mescheryakova N.E.,Volgograd Business Institute
Semiconductors | Year: 2010

The effect of an ac electric field on the conductance of a system of single-wall semiconductor-type carbon nanotubes placed in a dc electric field is considered. The strength vectors of dc and ac electric fields are directed along the nanotube axis. The electronic system of carbon nanotubes is considered in the context of the Boltzmann kinetic equation in the relaxation-time approximation. The dependence of the current density in the system on the characteristics of applied fields is studied. The effect of absolute negative conductance is detected. © 2010 Pleiades Publishing, Ltd.


Belonenko M.B.,Volgograd State Pedagogical University | Fedorov E.G.,Volgograd State University
Optics and Spectroscopy (English translation of Optika i Spektroskopiya) | Year: 2012

The propagation of monochromatic laser radiation in a volume system of quantum dots (QDs) that are tunnel-coupled along one axis is considered. The electron energy spectrum of the QD system is modeled in the tight-binding approximation with allowance for the Coulomb interaction of electrons in the Hubbard model. The electromagnetic field of laser radiation in a QD system is described quasi-classically by Maxwell equations; as applied to this problem, they are reduced to a non-one-dimensional wave equation for the vector potential. As a result of the analysis of the wave equation in the approximation of varying amplitudes and phases, an effective equation describing the electromagnetic field in a QD system is obtained and numerically solved. The influence of the parameters of the system and the amplitude and frequency of the field of incident laser radiation on the character of its propagation is investigated. Nonmonotonic dependences of the factor characterizing the laser beam diffraction spread on the parameters of the electron energy spectrum of the system are obtained. © 2012 Pleiades Publishing, Ltd.


Belonenko M.B.,Volgograd State Pedagogical University | Fedorov E.G.,Volgograd State University of Architecture and Civil Engineering
Optics and Spectroscopy (English translation of Optika i Spektroskopiya) | Year: 2011

We considered the propagation of laser monochromatic radiation in a superlattice that contains regions with an elevated concentration of carriers. The model of the energy spectrum of electrons is chosen in the strong coupling approximation. The electromagnetic field is described quasiclassically with Maxwell equations, which, as applied to the problem under study, are reduced to a non-one-dimensional sine-Gordon wave equation for the vector-potential. We analyzed the wave equation in the approximation of slowly varying amplitudes and phases and obtained and numerically solved an effective equation that describes the electromagnetic field in the superlattice. We studied different regimes of propagation of laser radiation, analyzed diffraction by regions with an elevated electron concentration. © 2011 Pleiades Publishing, Ltd.


Kryuchkov S.V.,Volgograd State Pedagogical University | Kuhar E.I.,Volgograd State Pedagogical University
Semiconductors | Year: 2012

The longitudinal current-voltage characteristic of a graphene-based superlattice in high-frequency electric fields, such that the strength of one of the fields oscillates along the superlattice axis and the strength of the other perpendicularly to this axis, is calculated. It is shown that, if there is a transverse high-frequency field only, there exists a possibility for sharply increasing the current density in the negative-differential-conductivity region of the static current-voltage characteristic of the superlattice. The current density exhibits a jump, if the oscillation frequency of the field strength approaches the Bloch oscillation frequency. It is shown that, in such a situation, absorption of an electromagnetic wave in the graphene-based superlattice gives way to amplification. © 2012 Pleiades Publishing, Ltd.


Zavialov D.V.,Volgograd State Pedagogical University | Konchenkov V.I.,Volgograd State Pedagogical University | Kruchkov S.V.,Volgograd State Pedagogical University
Semiconductors | Year: 2012

A model of the energy spectrum of a superlattice based on graphene overlying a substrate of periodically arranged layers of different insulators is proposed. For such a structure, the dc current component induced by an elliptically polarized electromagnetic wave and directed normally to the sweeping field is calculated. The dependence of the transverse current density on the strengths of the sweeping electric field and the elliptically polarized wave components is analyzed. © 2012 Pleiades Publishing, Ltd.


Kryuchkov S.V.,Volgograd State Pedagogical University | Kukhar' E.I.,Volgograd State Pedagogical University
Physics of the Solid State | Year: 2012

The effect of a magnetic field on the conductivity of band-gap graphene has been investigated. In the case of a non-quantizing field, the magnetic-field dependences of the conductivity and Hall conductivity have been found on the basis of the Boltzmann equation. The formula for the conductivity of graphene in a quantizing magnetic field at low temperatures has been derived within the Born approximation in the scattering potential. It has been shown that the magnetic-field dependence of the conductivity is oscillatory in this case. © 2012 Pleiades Publishing, Ltd.


Zavyalov D.V.,Volgograd State Pedagogical University | Kryuchkov S.V.,Volgograd State Pedagogical University | Tyul'kina T.A.,Volgograd State Pedagogical University
Semiconductors | Year: 2010

Appearance of a dc component (normal to the applied dc electric field) in the electric current induced in graphene by an elliptically polarized electromagnetic wave propagating normally to the sample plane is studied by a direct Monte Carlo numerical simulation. The dependence of the current on the frequency of the incident wave and the phase shift between its components is analyzed. © 2010 Pleiades Publishing, Ltd.


Zav'yalov D.V.,Volgograd State Pedagogical University | Konchenkov V.I.,Volgograd State Pedagogical University | Kryuchkov S.V.,Volgograd State Pedagogical University
Physics of the Solid State | Year: 2010

The direct component of the electric current induced in graphene placed in a constant magnetic field has been found in the case where two electromagnetic waves with two mutually perpendicular planes of polarization are normally incident on the surface of the sample. It has been demonstrated that the direct component of the current along the direction of the electric field vector of the wave with the frequency ω1 arises only when the ratio between the frequencies of the incident waves is ω1/ω2 = 2 or 1/2. In the latter case, the direct current component appears only in the presence of a magnetic field. © Pleiades Publishing, Ltd 2010.


Glazov S.Y.,Volgograd State Pedagogical University | Kubrakova E.S.,Volgograd State Pedagogical University
Bulletin of the Russian Academy of Sciences: Physics | Year: 2011

The effect of a constant electric field on plasma waves in a two-dimensional electronic gas in a sys- tem with periodic potential is investigated. A dispersion relation ω(k) is obtained using the high temperature approach. The main and resonant modes of plasma waves are investigated numerically. Regions of one-par- ticle and collective excitations are identified. Calculations are performed on the basis of the plasma wave quantum theory in a random-phase approximation with allowance for the Umklapp processes. © Allerton Press, Inc., 2011.


Kryuchkov S.V.,Volgograd State Pedagogical University | Kukhar' E.I.,Volgograd State Pedagogical University | Yakovenko V.A.,Volgograd State Pedagogical University
Bulletin of the Russian Academy of Sciences: Physics | Year: 2010

The effect of the mutual rectification of two electromagnetic waves with perpendicular polarization planes in a superlattice based on graphene was investigated. It was shown that, due to the nonadditive nature of the electronic spectrum of a superlattice based on grapheme, a constant term of current arises along its axes. The dependence of the constant of current density on the intensity of an electromagnetic wave is oscillatory in nature. © 2010 Allerton Press, Inc.

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