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Counterpropagating topological and quantum Hall edge channels

Author

Listed:
  • Saquib Shamim

    (Universität Würzburg
    Universität Würzburg)

  • Pragya Shekhar

    (Universität Würzburg
    Universität Würzburg)

  • Wouter Beugeling

    (Universität Würzburg
    Universität Würzburg)

  • Jan Böttcher

    (Universität Würzburg)

  • Andreas Budewitz

    (Universität Würzburg
    Universität Würzburg)

  • Julian-Benedikt Mayer

    (Universität Würzburg)

  • Lukas Lunczer

    (Universität Würzburg
    Universität Würzburg)

  • Ewelina M. Hankiewicz

    (Universität Würzburg)

  • Hartmut Buhmann

    (Universität Würzburg
    Universität Würzburg)

  • Laurens W. Molenkamp

    (Universität Würzburg
    Universität Würzburg)

Abstract

The survival of the quantum spin Hall edge channels in presence of an external magnetic field has been a subject of experimental and theoretical research. The inversion of Landau levels that accommodates the quantum spin Hall effect is destroyed at a critical magnetic field, and a trivial insulating gap appears in the spectrum for stronger fields. In this work, we report the absence of this transport gap in disordered two dimensional topological insulators in perpendicular magnetic fields of up to 16 T. Instead, we observe that a topological edge channel (from band inversion) coexists with a counterpropagating quantum Hall edge channel for magnetic fields at which the transition to the insulating regime is expected. For larger fields, we observe only the quantum Hall edge channel with transverse resistance close to h/e2. By tuning the disorder using different fabrication processes, we find evidence that this unexpected ν = 1 plateau originates from extended quantum Hall edge channels along a continuous network of charge puddles at the edges of the device.

Suggested Citation

  • Saquib Shamim & Pragya Shekhar & Wouter Beugeling & Jan Böttcher & Andreas Budewitz & Julian-Benedikt Mayer & Lukas Lunczer & Ewelina M. Hankiewicz & Hartmut Buhmann & Laurens W. Molenkamp, 2022. "Counterpropagating topological and quantum Hall edge channels," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-29815-2
    DOI: 10.1038/s41467-022-29815-2
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    References listed on IDEAS

    as
    1. Eric Yue Ma & M. Reyes Calvo & Jing Wang & Biao Lian & Mathias Mühlbauer & Christoph Brüne & Yong-Tao Cui & Keji Lai & Worasom Kundhikanjana & Yongliang Yang & Matthias Baenninger & Markus König & Chr, 2015. "Unexpected edge conduction in mercury telluride quantum wells under broken time-reversal symmetry," Nature Communications, Nature, vol. 6(1), pages 1-6, November.
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