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

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

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

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.

Original languageEnglish
Article numbereaaz3595
JournalScience Advances
Volume6
Issue number25
DOIs
Publication statusPublished - 2020 Jun

All Science Journal Classification (ASJC) codes

  • General

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