Zero-resistance states induced by bichromatic microwaves

We have studied the bichromatic photoresistance states of a two dimensional electron gas in the regime of microwave induced resistance oscillations. Zudov and coworkers found clear experimental evidence of zero‐resistance states by measuring the bichromatic resistance in a bidimensional gas of elect...

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Veröffentlicht in:Physica status solidi. A, Applications and materials science Applications and materials science, 2007-02, Vol.204 (2), p.467-471
Hauptverfasser: Kunold, Alejandro, Torres, Manuel
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Torres, Manuel
description We have studied the bichromatic photoresistance states of a two dimensional electron gas in the regime of microwave induced resistance oscillations. Zudov and coworkers found clear experimental evidence of zero‐resistance states by measuring the bichromatic resistance in a bidimensional gas of electrons. They found that the bichromatic resistance closely replicates the superposition of the two monochromatic components provided that both contributions are positive. However, the superposition principle is no longer valid if one of the two contributions give rise to a zero‐resistance state. The experiments by Zudov and coworkers confirm that negative resistance states are rapidly driven into zero‐resistance states by an instability. In this work we present a model for the bichromatic‐photoconductivity of a two dimensional electron system subjected to a uniform magnetic field. Our model includes both components of the microwave radiation, a uniform magnetic field and impurity scattering effects. The conductivity is calculated from a Kubo‐like formula. Our calculations reproduce the main features of Zudov's experimental results. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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subjects 73.23.−l
73.43.Qt
73.50.Pz
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronic transport in multilayers, nanoscale materials and structures
Exact sciences and technology
Physics
title Zero-resistance states induced by bichromatic microwaves
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