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

• DOI: 10.1126/sciadv.aaz3595
• Publication Date: 2020-06-17T23:13:24Z
• Authors: 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
• Keywords: Limiting; Topological insulator

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 material's magnetic ordering can go beyond 100 K. Here, we study limiting factors of Cr-doped (BiSb)2Te3 systems using both transport and magneto-optical methods. By deliberate control thin-film thickness doping profile, revealed that low occurring quantum current material system a combined result weak ferromagnetism trivial band involvement. Our findings may provide important insights into search for high-temperature insulator other topologically related phenomena.