Quantum Anomalous Hall Multilayers Grown by Molecular Beam Epitaxy  

作　　者：姜高源 冯洋 吴伟雄 李绍锐 白云鹤 李耀鑫 张庆华 谷林 冯硝 张定 宋灿立 王立莉 李渭 马旭村 薛其坤 王亚愚 何珂 

机构地区：[1]State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University [2]Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences

出　　处：《Chinese Physics Letters》2018年第7期62-66,共5页中国物理快报（英文版）

基　　金：Supported by the National Key Research and Development Program of China under Grant No 2017YFA0303303;the National Natural Science Foundation of China under Grant No 51661135024;the Beijing Advanced Innovation Center for Future Chip(ICFC)

摘　　要：Quantum anomalous Hall（QAH） effect is a quantum Hall effect that occurs without the need of external magnetic field. A system composed of multiple parallel QAH layers is an effective high Chern number QAH insulator and the key to the applications of the dissipationless chiral edge channels in low energy consumption electronics. Such a QAH multilayer can also be engineered into other exotic topological phases such as a magnetic Weyl semimetal with only one pair of Weyl points. This work reports the first experimental realization of QAH multilayers in the superlattices composed of magnetically doped（Bi,Sb）2Te3 topological insulator and Cd Se normal insulator layers grown by molecular beam epitaxy. The obtained multilayer samples show quantized Hall resistance h/Ne2, where h is Planck＇s constant, e is the elementary charge and N is the number of the magnetic topological insulator layers, resembling a high Chern number QAH insulator. The QAH multilayers provide an excellent platform to study various topological states of matter.Quantum anomalous Hall（QAH） effect is a quantum Hall effect that occurs without the need of external magnetic field. A system composed of multiple parallel QAH layers is an effective high Chern number QAH insulator and the key to the applications of the dissipationless chiral edge channels in low energy consumption electronics. Such a QAH multilayer can also be engineered into other exotic topological phases such as a magnetic Weyl semimetal with only one pair of Weyl points. This work reports the first experimental realization of QAH multilayers in the superlattices composed of magnetically doped（Bi,Sb）2Te3 topological insulator and Cd Se normal insulator layers grown by molecular beam epitaxy. The obtained multilayer samples show quantized Hall resistance h/Ne2, where h is Planck＇s constant, e is the elementary charge and N is the number of the magnetic topological insulator layers, resembling a high Chern number QAH insulator. The QAH multilayers provide an excellent platform to study various topological states of matter.

分 类 号：O469[理学—凝聚态物理]