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Hidden quantum Hall stripes in Al<sub>x</sub>Ga<sub>1-x</sub>As/Al<sub>0.24</sub>Ga<sub>0.76</sub>As quantum wells

ORAL

Abstract

We report on transport signatures of hidden quantum Hall stripe (hQHS) phases in high (N > 2) half-filled Landau levels of AlxGa1−xAs/Al0.24Ga0.76As quantum wells with varying Al mole fraction x < 10−3. Residing between the conventional stripe phases (lower N) and the isotropic liquid phases (higher N), where resistivity decreases as 1/N, these hQHS phases exhibit isotropic and N-independent resistivity. Using the experimental phase diagram we establish that the stripe phases are more robust than theoretically predicted, calling for improved theoretical treatment. We also show that, unlike conventional stripe phases, the hQHS phases do not occur in ultrahigh mobility GaAs quantum wells, but are likely to be found in other systems.

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Presenters

  • Xiaojun Fu

    University of Minnesota

Authors

  • Xiaojun Fu

    University of Minnesota

  • Yi Huang

    University of Minnesota

  • Boris Iona Shklovskii

    University of Minnesota

  • Michael A Zudov

    University of Minnesota

  • Geoff C Gardner

    Department of Physics and Astronomy and Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA, Purdue University

  • Michael Manfra

    Purdue University, Purdue Univ, Department of Physics and Astronomy and Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA, Department of Physics and Astronomy and Station Q Purdue, Purdue University, Niels Bohr Institute, Microsoft Station Q, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark, Department of Physics and Astronomy, Purdue University, Birck Nanotechnology Center and Microsoft Quantum Purdue, Purdue University