Nature Communications (May 2022)

Counterpropagating topological and quantum Hall edge channels

  • Saquib Shamim,
  • Pragya Shekhar,
  • Wouter Beugeling,
  • Jan Böttcher,
  • Andreas Budewitz,
  • Julian-Benedikt Mayer,
  • Lukas Lunczer,
  • Ewelina M. Hankiewicz,
  • Hartmut Buhmann,
  • Laurens W. Molenkamp

DOI
https://doi.org/10.1038/s41467-022-29815-2
Journal volume & issue
Vol. 13, no. 1
pp. 1 – 7

Abstract

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The quantum spin Hall effect disappears at high magnetic fields when the band inversion is lifted. The authors demonstrate that in contrast, in disordered samples, counter-propagating topological and quantum Hall edge channels prevent the detection of the trivial gap, explaining a previous observation.