Temperature-induced transport asymmetry around half-filling in high Landau levels

ORAL

Abstract

We report a temperature dependence study of transport properties in an ultra-low disorder GaAs two-dimensional electron system around half-filling of the N = 2 Landau level. In this study, we performed measurements of both the zero-bias magnetoresistance Rxx and the differential resistance dVxx/dI along the hard transport direction around filling factor ν = 9/2 at different temperatures. At high temperature, T = 100 mK, both Rxx and dVxx/dI are symmetric around ν = 9/2. However, as temperature is decreased towards T = 10 mK both Rxx and dVxx/dI become asymmetric: the Rxx peak shifts to lower magnetic field away from exact half-filling, and dVxx/dI shows strong non-linearity on the high field side of the Rxx peak. Our data suggests that a temperature induced breakdown of particle-hole symmetry occurs at low temperatures. At high temperature T = 100 mK where the system behaves as a standard anisotropic nematic, particle-hole symmetry is restored.

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Presenters

  • Qi Qian

    Physics, Purdue University, Purdue University, Purdue Univ

Authors

  • Qi Qian

    Physics, Purdue University, Purdue University, Purdue Univ

  • James Nakamura

    Physics, Purdue University, Purdue Univ

  • Michael Yannell

    Purdue Univ

  • Saeed Fallahi

    Purdue Univ

  • Geoffrey Gardner

    Department of Physics and Astronomy and Station Q Purdue, Purdue University, Microsoft Station Q Purdue, Birck Nanotechnology Center, Purdue University, Purdue University, Station Q Purdue, Purdue Univ, Purdue University, Physics and Astronomy, Purdue University

  • Michael Manfra

    Department of Physics and Astronomy and Station Q Purdue, Purdue University, Department of Physics and Astronomy and Microsoft Station Q Purdue, Purdue University, Purdue University, Physics, Purdue University, Purdue University, Station Q Purdue, Purdue Univ, Department of Physics and Astronomy, and School of Materials Engineering, and School of Electrical and Computer Engineering, Purdue University, Physics and Astronomy, Purdue University, Dept. of Physics and Astronomy, Purdue Univ