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