Giant negative magnetoresistance in irradiated two-dimensional electron systems

ORAL

Abstract

Several recent magnetotransport studies in high-mobility two-dimensional electron systems reported very strong negative magnetoresistance whose origin remains unclear. In an attempt to advance our understanding of this phenomenon, we have performed measurements on microwave-irradiated GaAs/AlGaAs heterostructures and quantum wells exhibiting giant magnetoresistance. We have found that microwave photoresistance is usually positive over a wide range of magnetic fields indicating that negative magnetoresistance is suppressed by microwave radiation. This suppression, however, is too strong to be attributed solely to radiation-induced heating of electrons.

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Authors

  • Michael Zudov

    • School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
    • University of Minnesota

  • Q. Shi

    • School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA

  • P.D. Martin

    • School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA

  • Q.A. Ebner

    • School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA

  • J.L. Reno

    • Sandia National Laboratories, Albuquerque, New Mexico 87185, USA

  • L.N. Pfeiffer

    • Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA

  • K.W. West

    • Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA