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Strain-induced resistance anisotropy near the FQHE v=5/2 in two-dimensional GaAs single quantum wells

ORAL

Abstract

We report strain-dependent low temperature magnetotransport measurements of a two-dimensional electron gas (2DEG) confined in GaAs single quantum wells. The samples are mounted to a piezoelectric-based strain device with which we can, in situ, apply and vary tensile strain. With this apparatus, we have achieved strain as large as ~0.5% in GaAs quantum wells at cryogenic temperatures. We find that increasing strain causes the magnetoresistance of the 2DEG confined in the quantum well to become anisotropic near the filling factor v = 5/2. Additionally, we find that the effects of strain are highly dependent on the magnitude of the magnetic field applied. These anisotropic states are metastable and resume an isotopic state after a temperature dependent decay.

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Presenters

  • Alexander Stern

    Max Planck Inst

Authors

  • Alexander Stern

    Max Planck Inst

  • Brian Casas

    Department of Physics and Astronomy, University of California Irvine

  • Johannes Pollanen

    Department of Physics and Astronomy, Michigan State University, Michigan State Univ

  • James Eisenstein

    Department of Physics, California Institute of Technology, physics, Caltech

  • Kenneth West

    Princeton University, Electrical Engineering, Princeton University, Electrical engineering, Princeton university, Princeton Univ, Department of Electrical Engineering, Princeton University, electrical engineering, Princeton, Department of Electrical Engineering, Princeton University, Princeton, NJ, 08544, USA

  • Loren Pfeiffer

    Princeton University, Electrical Engineering, Princeton University, Electrical engineering, Princeton university, Princeton Univ, Department of Electrical Engineering, Princeton University, electrical engineering, Princeton, Department of Electrical Engineering, Princeton University, Princeton, NJ, 08544, USA

  • Jing Xia

    University of California, Irvine, Department of Physics and Astronomy, University of California Irvine