Microwave photo-excited transport in the GaAs/AlGaAs 2DES

ORAL

Abstract

Collective bulk plasmon excitations of a two dimensional electronic system (2DES) evolve into magnetoplasmons in the presence of a perpendicular magnetic field, with a low frequency cutoff determined by the dispersion relation ωMP = (ωC2 + ωP2)1/2, where the plasmon frequency ωP2 = (ne2 /2εeffεom*)k, with k the plasmon wave vector, and ωc the cyclotron resonance frequency. Studies of narrow Hall bar type GaAs/AlGaAs specimens of width, w, have long ago suggested that localization of the plasmon within the boundaries of the sample can lead to the wave vector selection k = π/w and the observation of the corresponding resonance in magnetotransport under photoexcitation. The observation of zero-resistance states and associated radiation induced magnetoresistance oscillations under microwave/mm-wave/terahertz photoexcitation has brought new interest in the role of the magnetoplasmon, if any, in the ultra high mobility GaAs/AlGaAs 2DES and its interaction with this photo-excited transport phenomena mentioned above. In this study, we re-examine through experiment the role of the magnetoplasmon in the GaAs/AlGaAs magnetotransport and report the results.

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Presenters

  • Ramesh Mani

    Physics and Astronomy, Georgia State University, Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA, Georgia State University, Department of Physics and Astronomy, Georgia State University, Physics & Astronomy, Georgia State University

Authors

  • Annika Kriisa

    Physics and Astronomy, Georgia State University, Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA, Georgia State University, Department of Physics and Astronomy, Georgia State University, Physics & Astronomy, Georgia State University

  • Christian Reichl

    Solid State Physics, ETH Zürich, Laboratorium für Festkörperphysik, ETH Zürich, ETH Zürich, CH-8093 Zürich, Switzerland, Laboratorium für Festkörperphysik, ETH-Zurich, Solid State Physics Laboratory, ETH Zurich, Laboratorium für Festkörperphysik, ETH-Zürich, Department of Physics, ETH Zurich, Department of Physics, ETH Zurich, Switzerland, ETH Zurich

  • Werner Wegscheider

    Solid State Physics, ETH Zürich, Laboratorium für Festkörperphysik, ETH Zürich, ETH Zürich, CH-8093 Zürich, Switzerland, Laboratorium für Festkörperphysik, ETH-Zurich, Solid State Physics Laboratory, ETH Zurich, Laboratorium für Festkörperphysik, ETH-Zürich, Department of Physics, ETH Zurich, Department of Physics, ETH Zurich, Switzerland, ETH Zurich

  • Ramesh Mani

    Physics and Astronomy, Georgia State University, Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA, Georgia State University, Department of Physics and Astronomy, Georgia State University, Physics & Astronomy, Georgia State University