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arXiv · 2405.19983

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

Torsten Röper·Hugo Thomas·Daniel Rosenbach·Anjana Uday·Gertjan Lippertz·Anne Denis·Pascal Morfin·Alexey A. Taskin·Yoichi Ando·Erwann Bocquillon
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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 non-reciprocal microwave devices. While recent research showed the non-reciprocity of edge plasmons in Cr-doped $\mathrm{(Bi_xSb_\text{1-x})_2Te_3}$, the understanding of their dissipation remains incomplete. Our study explores edge plasmon dissipation in V-doped $\mathrm{(Bi_xSb_\text{1-x})_2Te_3}$ films, analyzing microwave transmission across various conditions. We identify interactions with charge puddles as a primary source of dissipation, providing insights critical for developing improved QAH-based technologies.

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Torsten Röper, Hugo Thomas, Daniel Rosenbach, Anjana Uday, Gertjan Lippertz, Anne Denis, Pascal Morfin, Alexey A. Taskin, Yoichi Ando, Erwann Bocquillon. 2024-05-30. Propagation, dissipation and breakdown in quantum anomalous Hall edge states probed by microwave edge plasmons. https://doi.org/10.1103/physrevb.110.l161403

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