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arXiv · 2505.23156

Breakdown of the quantum anomalous Hall effect under microwave drives

Torsten Röper·Daniel Rosenbach·Achim Rosch·Alexey A. Taskin·Yoichi Ando·Erwann Bocquillon
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Abstract

Quantum anomalous Hall (QAH) insulators exhibit chiral dissipationless edge states without an external magnetic field, making them a promising material for quantum metrology and microwave applications. However, the breakdown of the zero-resistance state at low currents hinders progress. We investigate and characterize this breakdown under microwave fields (1-25 GHz) by measuring the increase of longitudinal resistance in RF Hall bars and RF Corbino devices made from V-doped (Bi,Sb)$_2$Te$_3$ films. Our results point to the role of heating of electron-hole puddles under microwave irradiation, thereby fostering hopping transport. Our work offers insights critical for GHz-range QAH applications.

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Torsten Röper, Daniel Rosenbach, Achim Rosch, Alexey A. Taskin, Yoichi Ando, Erwann Bocquillon. 2025-05-29. Breakdown of the quantum anomalous Hall effect under microwave drives. https://arxiv.org/abs/2505.23156

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