Microwave photoconductivity of a 2D electron gas: Mechanisms and their interplay at high radiation power

Abstract

We develop a systematic theory of microwave-induced oscillations in the magnetoresistivity of a two-dimensional electron gas, focusing on the regime of strongly overlapping Landau levels. At linear order in microwave power, two novel mechanisms of the oscillations (``quadrupole'' and ``photovoltaic'') are identified, in addition to those studied before (``displacement'' and ``inelastic''). The quadrupole and photovoltaic mechanisms are shown to be the only ones that give rise to oscillations in the nondiagonal part of the photoconductivity tensor. In the diagonal part, the inelastic contribution dominates at moderate microwave power, while at elevated power the other mechanisms become relevant. We demonstrate the crucial role of feedback effects, which lead to a strong interplay of the four mechanisms in the nonlinear photoresponse and yield, in particular, a nonmonotonic power dependence of the photoconductivity, narrowing of the magnetoresonances, and a nontrivial structure of the Hall photoresponse. At ultrahigh power, all effects related to the Landau quantization decay due to a combination of the feedback and multiphoton effects, restoring the classical Drude conductivity.

arXiv comment26 pages, 10 figures. V2: published version (typos corrected, references updated)

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Cited by in corpus (56)

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• Resonant Phonon Scattering in Quantum Hall Systems Driven by dc Electric Fields
• Giant negative magnetoresistance in high-mobility 2D electron systems
• Nonlinear growth with the microwave intensity in radiation-induced magnetoresistance oscillations
• Temperature Dependence of Microwave Photoresistance in 2D Electron Systems
• Theory of the microwave induced zero resistance states in two-dimensional electron systems
• Observation of linear-polarization-sensitivity in the microwave-radiation-induced magnetoresistance oscillations
• Interference oscillations of microwave photoresistance in double quantum wells
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