Microwave photoconductivity of two-dimensional electron systems with unidirectional periodic modulation

Abstract

Motivated by the recently discovered microwave-induced ``zero-resistance'' states in two-dimensional electron systems, we study the microwave photoconductivity of a two-dimensional electron gas (2DEG) subject to a unidirectional static periodic potential. The combination of this potential, the classically strong magnetic field, and the microwave radiation may result in an anisotropic negative conductivity of the 2DEG. Similar to the case of a smooth random potential, two mechanisms contribute to the negative photoconductivity. The displacement mechanism arises from electron transitions due to disorder-assisted microwave absorption and emission. The distribution-function mechanism arises from microwave-induced changes in the electron distribution. However, the replacement of a smooth random potential by the unidirectional one, leads to different relative strengths of the two contributions to the photoconductivity. The distribution function mechanism dominates the photoconductivity in the direction of the static potential modulation, while both mechanisms contribute equally strongly to the photoconductivity in the perpendicular direction. The unidirectionality of the static potential simplifies greatly the evaluation of the photoconductivities, which follow directly from Fermi's golden rule.

19 pages, 3 figures

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• Microwave photoconductivity of a 2D electron gas: Mechanisms and their interplay at high radiation power
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• Steady States of a Microwave Irradiated Quantum Hall Gas
• Radiation-induced magnetotransport in high-mobility two-dimensional systems: Role of electron heating
• Magnetoresistance Oscillations in Two-dimensional Electron Systems Induced by AC and DC Fields
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• Microwave photoresistance of a high-mobility two-dimensional electron gas in a triangular antidot lattice
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• Nonlinear resistance of 2D electrons in crossed electric and magnetic fields
• Nonlinear Current of Strongly Irradiated Quantum Hall Gas
• Hall field-induced resistance oscillations in tilted magnetic fields
• Driving Weiss oscillations to Zero Resistance States by Microwave Radiation
• Theory of the microwave-induced photocurrent and photovoltage magnetooscillations in a spatially non-uniform 2D electron gas
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• Photoconductivity in AC-driven modulated two dimensional electron gas in a perpendicular magnetic field
• Multiple and virtual photon processes in radiation-induced magnetoresistance oscillations in two-dimensional electron systems
• Microwave photoconductivity of a periodically modulated two-dimensional electron system: Striped states and overlapping Landau levels
• Magnetoresistance oscillations in two-dimensional electron systems under monochromatic and bichromatic radiations
• Quantum lifetime of 2D electron in magnetic field
• Radiation-induced magnetoresistance oscillations in two-dimensional electron systems under bichromatic irradiation
• Microwave photoresistance in a two-dimensional electron gas with separated Landau levels
• Nonlinear theory of fractional microwave-induced magnetoresistance oscillations in a dc-driven two-dimensional electron system
• Phonon-induced resistance oscillations of two-dimensional electron systems drifting with supersonic velocities
• Nonlinear magnetoresistance of an irradiated two-dimensional electron system
• Microwave modulation of electron temperature and Shubnikov-de Haas oscillation in two-dimensional electron systems
• Quantum and classical surface acoustic wave induced magnetoresistance oscillations in a 2D electron gas
• Quantum oscillations of dissipative resistance in crossed electric and magnetic fields
• Hall field induced magnetoresistance oscillations of a two-dimensional electron system
• Effect of Landau quantization on linear magnetoresistance of periodically modulated two-dimensional electron gas
• Magnetocapacitance oscillations and thermoelectric effect in two-dimensional electron gas irradiated by microwaves
• Fermi Liquid Model of Radiation Induced Magnetoresistance Oscillations in GaAs/Al${}_x$Ga${}_{1-x}$As Heterostructure Two-Dimensional Electron System: Theoretical Evidence of an Electron Reservoir
• Nonlocality, Correlations, and Magnetotransport in a Spatially Modulated Two-Dimensional Electron Gas
• Mesoscopic electron transport and atomic gases, a review of Frank W. J. Hekking's scientific work
• Microwave induced negative resistance states in 2D electron gas with periodic modulation