arXiv subjects

D. A. Rodionov

Publications and source records attributed to D. A. Rodionov.

6 recordsLinked to original sources

arXiv2026

Hybridization of Ferromagnetic and Cyclotron Resonances in a Two-Dimensional Electron System on a Ferromagnetic Film

The microwave response of a two-dimensional (2D) electron system located on a dielectric ferromagnetic film, which in turn lies on a conducting metal (gate), has been theoretically studied. The entire system has been placed in the perpendicular static magnetic field. It has been found that the ferromagnetic resonance of the film and the cyclotron resonance of the electrons of the 2D system interact in the magnetic field, leading to their repulsion ('anticrossing'). It has been revealed that the anticrossing region is characterized not only by the modification of resonance frequencies compared to the cyclotron resonance in the 2D system without the ferromagnetic substrate and the ferromagnetic resonance in the film without the 2D system, but also by a strong change in the resonance linewidths.

cond-mat.mes-hall↗

arXiv2025

Magnetoplasmon-Mediated Resonant Photogalvanic Effect in a Gated Strip of 2D Electrons

We theoretically investigate a nonlinear response to a linearly polarized monochromatic electromagnetic wave incident at an angle on a two-dimensional (2D) electronic system (ES) in the form of an infinite strip. The 2D ES is situated on a dielectric substrate near a perfectly conducting metal electrode (gate). The entire system is subjected to an external perpendicular constant magnetic field. We use Maxwell's equations for electromagnetic waves, while the electrons are described within the hydrodynamic approximation using Euler's equations and neglecting electromagnetic retardation effects. The incident electromagnetic wave excites magnetoplasmons in the strip. The fully screened limit is considered when all characteristic dimensions of the system, including the plasmon wavelengths, are much larger than the distance to the gate. This limit allows the linear response to be determined fully analytically. Due to the nonlinear hydrodynamic (convective) term, the excited magnetoplasmon oscillations give rise to a DC current along the strip and a voltage across it. Surprisingly, the relationship between the photocurrent and the photovoltage in resonance is exactly the same as in the classical Hall effect. The photovoltage is a monotonic function of the magnetic field. However, the photocurrent exhibits a minimum, which occurs at specific wavevector directions.

cond-mat.mes-hall↗

arXiv2025

Reduction of fully screened magnetoplasmons in a laterally confined anisotropic two-dimensional electron system to an isotropic one

We investigate the properties of natural two-dimensional (2D) magnetoplasma modes in laterally confined electron systems, such as 2D materials, quantum wells, or inversion layers in semiconductors, with an elliptic Fermi surface. The conductivity of the system is considered in a dynamical anisotropic Drude model. The problem is solved in the fully screened limit, i.e., under the assumption that the distance between the two-dimensional electron system and the nearby metal gate is small compared to all other lengths in the system, including the wavelength of plasmons. Remarkably, in this limit plasma oscillations in an anisotropic 2D confined system are equivalent to plasma oscillations in an isotropic 2D electron system obtained by some stretching, even when the electromagnetic retardation is taken into account. Moreover, accounting for electromagnetic retardation leads only to a renormalization of the effective masses of carriers, somewhat like in relativity. As an example, we reduce the equations describing plasmons in a gated disk with an anisotropic two-dimensional electron gas to the equations describing oscillations in an isotropic ellipse. Without a magnetic field, we solve them analytically and find eigenfrequencies. To find a solution in a magnetic field, we expand the current of plasma oscillations in the complete set of Mathieu functions. Leaving the leading terms of the expansion, we approximately find and analyze magnetodispersion for the lowest modes.

cond-mat.mes-hall↗

arXiv2024

Fully screened two-dimensional magnetoplasmons and rotational gravity shallow water waves in a rectangle

We study plasmons in a rectangular two-dimensional (2D) electron system in the vicinity of a planar metal electrode (gate) and in the presence of a perpendicular uniform magnetic field, using Maxwell's equations and neglecting retardation effects. The conductivity of the 2D system is characterized by the dynamical Drude model without taking collisional relaxation into account, which well describes both high mobility graphene and other field effect transistor structures, including quantum wells like Ga(Al)As, in the terahertz and in some cases sub-terahertz frequency ranges. Without a magnetic field, we analytically find the current distribution and frequency of plasma eigenmodes when the plasmon wavelength is much larger than the distance to the gate, i.e. in the fully screened limit. To find an approximate solution in a magnetic field, we expand current in the complete set of eigenmodes without magnetic fields. Analytical asymptotic expressions in weak and strong magnetic fields were obtained for the lower modes. Unlike the disk and stripe, the frequencies of these modes tend to zero as the magnetic field tends to infinity. We also discuss a direct analogy to rotational gravity shallow water waves, where size-quantized Poincare waves correspond to size-quantized magnetoplasmons, while Kelvin waves correspond to edge magnetoplasmons.

cond-mat.mes-hall↗

arXiv2022

Oscillations in the radiative damping of plasma resonances in a gated disk of 2D electron gas

We calculate the absorption spectra of a conductive disk in the presence of a metal gate. In our analysis, we use the conductivity described by the Drude model. We examine the frequency and line width of the absorption resonances associated with the excited plasma waves. They are estimated both numerically and analytically for the fundamental and axisymmetric plasma modes. The line width is determined by the collisional and radiative losses. In high mobility samples, the latter may dominate even when the resonant frequencies can be described by a standard quasistatic approximation, i.e., neglecting electromagnetic retardation. Placing a metal near the disk drastically affects the radiative broadening of the line width due to the interference of electromagnetic fields created by the disk and the metal charges. Bringing the disk in close proximity to the gate makes the total field almost vanish. In that case, the line width is defined solely by the collisional broadening. As the disk is moved away from the gate, the line width first shows a reduction since the plasmon transforms into plasmon-polariton, which is dressed with undamped electromagnetic field surrounding the disk. Then it increases and exhibits decaying oscillations, reaching the asymptotic value of the ungated disk.

cond-mat.mes-hall↗

arXiv2020

Effect of retardation on the frequency and linewidth of plasma resonances in a two-dimensional disk of electron gas

We theoretically analyze dominant plasma modes in a two-dimensional disk of electron gas by calculating the absorption of an incident electromagnetic wave. The problem is solved in a self-consistent approximation, taking into account electromagnetic retardation effects. We use the Drude model to describe the conductivity of the system. The absorption spectrum exhibits a series of peaks corresponding to the excitation of plasma waves. The position and linewidth of the peaks designating, respectively, the frequency and damping rate of the plasma modes. We estimate the influence of retardation effects on the frequency and linewidth of the fundamental (dipole) and axisymmetric (quadrupole) plasma modes both numerically and analytically. We find the net damping rate of the modes to be dependent on not only the sum of the radiative and collisional decays but also their intermixture, even for small retardation. We show that the net damping rate can be noticeably less than that determined by collisions alone.

cond-mat.mes-hall↗