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  • Letter
  • Open Access

Propagation, dissipation, and breakdown in quantum anomalous Hall edge states probed by microwave edge plasmons

Torsten Röper1, Hugo Thomas1, Daniel Rosenbach1, Anjana Uday1, Gertjan Lippertz1, Anne Denis2, Pascal Morfin2, Alexey A. Taskin1, Yoichi Ando1 et al.

Erwann Bocquillon1,*

  • *Contact author: bocquillon@ph2.uni-koeln.de
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Phys. Rev. B 110, L161403 – Published 7 October, 2024

DOI: https://doi.org/10.1103/PhysRevB.110.L161403

Abstract

The quantum anomalous Hall (QAH) effect, with its single chiral, topologically protected edge state, offers a platform for flying Majorana states as well as nonreciprocal microwave devices. While recent research showed the nonreciprocity of edge plasmons in Cr-doped (BixSb1−x)2Te3, the understanding of their dissipation remains incomplete. Our study explores edge plasmon dissipation in V-doped (BixSb1−x)2Te3 films, analyzing microwave transmission across various conditions. We identify interactions with charge puddles as a primary source, providing insights critical for developing improved QAH-based technologies.

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Phys. Rev. B 110, L161403– Published 7 October, 2024
  • Received 31 May 2024
  • Revised 1 August 2024
  • Accepted 26 August 2024
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