Study of the inelastic length under microwave photo-excitation in the GaAs/AlGaAs 2D electron system

ORAL

Abstract

Magnetotransport measurements in ultra-high mobility GaAs/AlGaAs 2D electron systems (2DES) exhibit a narrow negative magnetoresistance (MR) effect around the null magnetic field, which is similar in appearance to the well-known weak localization (WL) effect in metals, semiconductors, etc. However, the origin of WL-like effect in high mobility GaAs/AlGaAs 2DES specimens is still under debate. In this experimental work, the results exhibit that the incident microwave (MW) significantly modifies the observed narrow negative-MR feature, such that the WL-like peaks disappear at high power regime. This study aims to examine the influence of MW power on the WL-like effect. Thus, the observed negative-MR data were fit using 2D WL model by Hikami et al., to extract the characteristic inelastic length (li) as a function of MW power [1]. Results suggest that the fit extracted li is reduced by 50% upon increasing the MW power up to 2 mW. Further analysis of the data suggest that MW induced electron heating is partly responsible for the observed reduction in the li under photo-excitation.
1. S. Hikami, et. al., Prog. Theor. Phys. 63, 707-710 (1980)

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Presenters

  • Rasanga Samaraweera

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

Authors

  • Rasanga Samaraweera

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

  • Binuka Gunawardana

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

  • Tharanga Nanayakkara

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

  • C. Rasadi Munasinghe

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

  • U. Kushan Wijewardena

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

  • Sajith Withanage

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

  • 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