Microwave photoconductivity of a modulated two-dimensional electron gas due to intra-Landau-level transitions

Abstract

Motivated by a recent experiment, we study the microwave-induced photoconductivity of a twodimensional electron gas arising from intra-Landau-level transitions within a model where the electrons are subject to a unidirectional periodic potential in addition to a weaker impurity potential. With appropriate identifications, our results can be compared to experiment and allow us to explain the sign of the photocurrent, its dependence on magnetic field and microwave frequency as well as the microwave-induced suppression of the Shubnikov-deHaas oscillations.

Microwave photoconductivity of a periodically modulated two-dimensional electron system: Striped states and overlapping Landau levels

“…In the perpendicular direction, we find a strong enhancement of the displacement mechanism photocurrent such that in this case both contributions are of the same order. In a recent paper [20], we calculated the various conductivities in the regime ω/ω c ≪ 1 which, experimentally, for the case without periodic modulation potential, has shown a strong suppression of the Shubnikov de-Haas oscillations [21,22], in accordance with our calculation. Further theoretical work on this subject was done in [23,24].…”

Microwave-induced resistance oscillations and zero-resistance states in two-dimensional electron systems with two occupied subbands

“…[2][3][4] These remarkable effects show up at low B and high mobility samples, especially ZRS where ultraclean samples are needed. Different theories have been proposed to explain these striking effects [5][6][7][8][9][10][11] but the physical origin is still being questioned. To shed some light on the physics behind them, a great effort has been made, especially from the experimental side, growing better samples, adding new features and different probes to the basic experimental setup, etc.…”

Multiple and virtual photon processes in radiation-induced magnetoresistance oscillations in two-dimensional electron systems

“…1-4 Tremendous experimental [5][6][7][8][9][10][11][12][13][14] and theoretical [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] efforts have been devoted to study this exciting phenomenon and a general understanding of it has been reached. MIMOs emerge as the magnetoresistance R xx of the 2D system subject to a microwave radiation of frequency f = /2, exhibiting periodic oscillation as a function of the inverse magnetic field 1 / B.…”