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 electrons gas confined in GaAs single quantum wells. The samples are mounted to a piezoelectric-based strain device with which we can apply, and vary, tensile strain in the quantum well in situ. With this apparatus we have achieved strain as large as ~0.5% in GaAs quantum wells at cryogenic temperatures. We find that with increasing strain with a high magnetic field applied causes the magnetoresistance of the two-dimensional electron system confined in the quantum well to develop anisotropic resistance near the FQHE v = 5/2. Additionally, we find that this strain and field induced resistance anisotropy is caused by a meta-stable phase that has a temperature dependent decay back to its isotropic state.

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Presenters

  • Alexander Stern

    Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids

Authors

  • Alexander Stern

    Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids

  • Brian Casas

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

  • Johannes Pollanen

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

  • James Eisenstein

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

  • Kenneth West

    Electrical Engineering, Princeton University, Princeton University, Princeton Univ, Department of Electrical Engineering, Princeton University, PRISM, Princeton University, Physics, University of Pittsburgh, Electrical Engineering, Princeton

  • Loren Pfeiffer

    Electrical Engineering, Princeton University, Princeton University, Princeton Univ, Department of Electrical Engineering, Princeton University, PRISM, Princeton University, Physics, Princeton University, Electrical Engineering, Princeton

  • Jing Xia

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