Study of a weak-localization like negative magnetoresistance effect in the high mobility GaAs/AlGaAs 2DES

ORAL

Abstract

High mobility two-dimensional electron systems (2DES) realized with GaAs/AlGaAs heterostructures exhibit interesting electrical and physical phenomena including novel microwave induced zero-resistance states, radiation-induced magnetoresistance oscillations [1-2], giant magnetoresistance [3-5], and also a weak-localization (WL)-like magnetoresistance effect. In this contribution, we present a study of the WL-like effect in GaAs/AlGaAs 2DES that appears at low magnetic fields and attempt to fit the effect using 2D WL theory without including the spin-orbit correction to the conductivity. This study aims to explore the temperature dependence of the WL-like effect and extract the phase coherence times using the fit. The fit extracted phase coherence times are compared with the single particle scattering time and the transport scattering times to examine whether the observed effect represents the signatures of the well-known WL effect.
1. R. G. Mani, et al. Phys. Rev. B.69, 161306 (2004).
2. R. G. Mani, et al. Phys. Rev. B.81, 125320 (2010).
3. R. G. Mani, et al. Sci. Rep. 3, 2747 (2013).
4. Z. Wang, et al. Sci. Rep. 6, 38515 (2016).
5. R. L. Samaraweera, et al. Sci. Rep. 7, 5074 (2017).

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Presenters

  • Rasanga Samaraweera

    Physics & Astronomy , Georgia State University, Physics & Astronomy, Georgia State University, Georgia State Univ, Department of Physics, Georgia State University

Authors

  • Rasanga Samaraweera

    Physics & Astronomy , Georgia State University, Physics & Astronomy, Georgia State University, Georgia State Univ, Department of Physics, Georgia State University

  • Binuka Gunawardana

    Physics & Astronomy , Georgia State University, Georgia State Univ, Physics and Astronomy , Georgia State University, Department of Physics, Georgia State University, Physics and Astronomy, Georgia State University, 25 Park Place, #605, Georgia State University

  • Annika Kriisa

    Physics & Astronomy , Georgia State University, Physics & Astronomy, Georgia State University, Georgia State Univ, Physics and Astronomy , Georgia State University, Department of Physics, Georgia State University, Physics and Astronomy, Georgia State University, 25 Park Place, #605, Georgia State University, Dept. of Physics and Astronomy, Georgia State Univ

  • Tharanga Nanayakkara

    Physics & Astronomy , Georgia State University, Physics & Astronomy, Georgia State University, Georgia State Univ, Physics and Astronomy , Georgia State University, Department of Physics, Georgia State University

  • C. Rasadi Munasinghe

    Physics & Astronomy , Georgia State University, Georgia State Univ, Department of Physics, Georgia State University

  • Christian Reichl

    ETH - Zurich, Physics, ETH Zurich, Department of Physics, ETH Zurich, Laboratorium fur Festkrperphysik, ETH-Zurich

  • Werner Wegscheider

    ETH - Zurich, Solid State Physics Laboratory, ETH Zurich, ETH Zurich, Physics, ETH Zurich, Department of Physics, ETH Zurich, Laboratory for Solid State Physics, ETH Zürich, Laboratorium fur Festkrperphysik, ETH-Zurich, Laboratorium fur Festkorperphysik, , ETH-Zurich, ETH Zürich, Laboratorium für Festkörperphysik, ETH Zürich, Laboratorium fur Festkorperphysik, ETH-Zurich

  • Ramesh Mani

    Physics & Astronomy , Georgia State University, Physics & Astronomy, Georgia State University, Georgia State Univ, Physics and Astronomy , Georgia State University, Department of Physics, Georgia State University, Physics and Astronomy, Georgia State University, 25 Park Place, #605, Georgia State University, Dept. of Physics and Astronomy, Georgia State Univ, Georgia State University