66 citations · 599 across the 37 of their papers we have counts for
25 papers · 1 filter
Beyond the ordinary acoustoelectric effect: superluminal phenomena in the acoustic realm and phonon-mediated Bloch gain
A. Apostolakis, A. G. Balanov, F. V. Kusmartsev +1
It has been shown that coherent phonons can be used as a potent tool for controlling and enhancing optoelectronic and transport properties of nanostructured materials. Recent studi…
Observation of the Dissipative Parametric Gain in a GaAs/AlGaAs Superlattice
Vladislovas Čižas, Liudvikas Subačius, Natalia V. Alexeeva +5
Parametric generation of oscillations and waves is a paradigm, which is known to be realized in various physical systems. Unique properties of quantum superlattices allow to invest…
Nonlinear dynamics and band transport in a superlattice driven by a plane wave
A. Apostolakis, M. K. Awodele, K. N. Alekseev +2
A quantum particle transport induced in a spatially-periodic potential by a propagating plane wave has a number important implications in a range of topical physical systems. Examp…
Physical Principles of the Amplification of Electromagnetic Radiation Due to Negative Electron Masses in a Semiconductor Superlattice
A. V. Shorokhov, M. A. Pyataev, N. N. Khvastunov +3
In a superlattice placed in crossed electric and magnetic fields, under certain conditions, the inversion of electron population can appear at which the average energy of electrons…
Devil's staircase, spontaneous-DC bias, and chaos via quasiperiodic plasma oscillations in semiconductor superlattices
Jukka Isohätälä, Kirill N. Alekseev
We study a plasma instability in semiconductor superlattices irradiated by a monochromatic, pure AC electric field. The instability leads to sustained oscillations at a frequency ω…
Model of the Influence of an External Magnetic Field on the Gain of Terahertz Radiation from Semiconductor Superlattices
Timo Hyart, Jussi Mattas, Kirill N. Alekseev
We theoretically analyze the influence of magnetic field on small-signal absorption and gain in a superlattice. We predict a very large and tunable THz gain due to nonlinear cyclot…
Terahertz Bloch oscillator with a modulated bias
Timo Hyart, Natalia V. Alexeeva, Jussi Mattas +1
Electrons performing Bloch oscillations in an energy band of a dc-biased superlattice in the presence of weak dissipation can potentially generate THz fields at room temperature. T…
Nondegenerate parametric amplification in superlattice and the limits of strong and weak dissipation
Timo Hyart, Kirill N. Alekseev
We develop a semiclassical theory of the nondegenerate parametric amplification in a single miniband of superlattice. We present the formulas describing absorption and gain of sign…
Theoretical backgrounds of nonlinear THz spectroscopy of semiconductor superlattices
Alexey V. Shorokhov, Kirill N. Alekseev
We consider terahertz absorption and gain in a single miniband of semiconductor superlattice subject to a bichromatic electric field in the most general case of commensurate freque…
Bloch gain in dc-ac-driven semiconductor superlattices in the absence of electric domains
Timo Hyart, Kirill N. Alekseev, Erkki V. Thuneberg
We study theoretically the feasibility of amplification and generation of terahertz radiation in dc-ac-driven semiconductor superlattices in the absence of electric domains. We fin…
Terahertz Parametric Gain in Semiconductor Superlattices
Timo Hyart, Alexey V. Shorokhov, Kirill N. Alekseev
We consider a high-frequency response of electrons in a single miniband of superlattice subject to dc and ac electric fields. Action of ac electric field causes oscillations of ele…
Theory of parametric amplification in in superlattices
Timo Hyart, Alexey V. Shorokhov, Kirill N. Alekseev
We consider a high-frequency response of electrons in a single miniband of superlattice subject to dc and ac electric fields. We show that Bragg reflections in miniband result in a…
THz parametric gain in semiconductor superlattices in the absence of electric domains
Timo Hyart, Natalia V. Alexeeva, Ahti Leppanen +1
We theoretically show that conditions for THz gain and conditions for formation of destructive electric domains in semiconductor superlattices are fairly different in the case of p…
Quantum derivatives and high-frequency gain in semiconductor superlattices
A. V. Shorokhov, K. N. Alekseev
We derive simple difference formulas describing a small-signal absorption of THz field in a semiconductor superlattice driven by a microwave pump. We give a transparent geometric i…
Suppressed absolute negative conductance and generation of high-frequency radiation in semiconductor superlattices
Kirill N. Alekseev, Maxim V. Gorkunov, Natalia V. Demarina +3
We show that space-charge instabilities (electric field domains) in semiconductor superlattices are the attribute of absolute negative conductance induced by small constant and lar…
Terahertz Bloch oscillator with suppressed electric domains: Effect of elastic scattering
Timo Hyart, Kirill N. Alekseev, Ahti Leppanen +1
We theoretically consider the amplification of THz radiation in a superlattice Bloch oscillator. The main dilemma in the realization of THz Bloch oscillator is finding operational…
Generation of high-frequency radiation in semiconductor superlattices with suppressed space-charge instabilities
Kirill N. Alekseev, Natalia V. Demarina, Maxim V. Gorkunov
We theoretically investigated the scheme allowing to avoid destructive space-charge instabilities and to obtain a strong gain at microwave and THz frequencies in semiconductor supe…
Pendulum limit, chaos and phase-locking in the dynamics of ac-driven semiconductor superlattices
Kirill N. Alekseev, Feodor V. Kusmartsev
We describe a limiting case when nonlinear dynamics of an ac-driven semiconductor superlattice in the miniband transport regime is governed by a periodically forced and damped pend…
Chaos and rectification of electromagnetic wave in a lateral semiconductor superlattice
Kirill N. Alekseev, Pekka Pietilainen, Alexander A. Zharov +1
We find the conditions for a rectification of electromagnetic wave in a lateral semiconductor superlattice with a high mobility of electrons. The rectification is assisted by a tra…
Symmetry-breaking and chaos in electron transport in semiconductor superlattices
Kirill N. Alekseev, Ethan H. Cannon, Jonathan C. McKinney +2
We study the motion of electrons in a single miniband of a semiconductor superlattice driven by THz electric field polarized along the growth direction. We work in the semiclassica…
Fractional and unquantized dc voltage generation in THz-driven semiconductor superlattices
Kirill N. Alekseev, Ethan H. Cannon, Feodor V. Kusmartsev +1
We consider the spontaneous creation of a dc voltage across a strongly coupled semiconductor superlattice subjected to THz radiation. We show that the dc voltage may be approximate…
Direct current generation due to harmonic mixing: From bulk semiconductors to semiconductor superlattices
Kirill N. Alekseev, Feodor V. Kusmartsev
We discuss an effect of dc current and dc voltage (stopping bias) generation in a semiconductor superlattice subjected by an ac electric field and its phase-shifted n-th harmonic.…
Direct current generation due to wave mixing in semiconductors
Kirill N. Alekseev, Mikhael V. Erementchouk, Feodor V. Kusmartsev
We describe a novel effect of the generation of direct current which may arise in semiconductors or semiconductor microstructures due to a mixing of coherent electromagnetic radiat…
Dynamical Instabilities and Deterministic Chaos in Ballistic Electron Motion in Semiconductor Superlattices
Kirill N. Alekseev, Gennady P. Berman, David K. Campbell
We consider the motion of ballistic electrons within a superlattice miniband under the influence of an alternating electric field. We show that the interaction of electrons with th…