Probing the low-temperature limit of the quantum anomalous Hall effect

Pan, Lei; Liu, Xiaoyang; He, Qing Lin; Stern, Alexander; Yin, Gen; Che, Xiaoyu; Shao, Qiming; Zhang, Peng; Deng, Peng; Yang, Chao-Yao; Casas, Brian; Choi, Eun Sang; Xia, Jing; Kou, Xufeng; Wang, Kang L.

doi:10.1126/sciadv.aaz3595

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Probing the low-temperature limit of the quantum anomalous Hall effect

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Stern, Alexander
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Pan, L., Liu, X., He, Q. L., Stern, A., Yin, G., Che, X., et al. (2020). Probing the low-temperature limit of the quantum anomalous Hall effect. Science Advances, 6: eaaz3595, pp. 1-9. doi:10.1126/sciadv.aaz3595.

Cite as: https://hdl.handle.net/21.11116/0000-0006-A30C-5

Abstract

Quantum anomalous Hall effect has been observed in magnetically doped topological insulators. However, full quantization, up until now, is limited within the sub-1 K temperature regime, although the material's magnetic ordering temperature can go beyond 100 K. Here, we study the temperature limiting factors of the effect in Cr-doped (BiSb)2Te3 systems using both transport and magneto-optical methods. By deliberate control of the thin-film thickness and doping profile, we revealed that the low occurring temperature of quantum anomalous Hall effect in current material system is a combined result of weak ferromagnetism and trivial band involvement. Our findings may provide important insights into the search for high-temperature quantum anomalous Hall insulator and other topologically related phenomena. © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).