Quantum Anomalous Hall Multilayers Grown by Molecular Beam Epitaxy
Gaoyuan Jiang1† , Yang Feng1† , Weixiong Wu1 , Shaorui Li1 , Yunhe Bai1 , Yaoxin Li1 , Qinghua Zhang2 , Lin Gu2 , Xiao Feng1 , Ding Zhang1 , Canli Song1 , Lili Wang1 , Wei Li1 , Xu-Cun Ma1 , Qi-Kun Xue1 , Yayu Wang1** , Ke He1**
1 State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 1000842 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190
Abstract ：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)$_{2}$Te$_{3}$ topological insulator and CdSe normal insulator layers grown by molecular beam epitaxy. The obtained multilayer samples show quantized Hall resistance $h/Ne^{2}$, 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.
收稿日期: 2018-06-08
出版日期: 2018-06-09
:
68.35.bg
(Semiconductors)
73.23.Ad
(Ballistic transport)
71.20.Nr
(Semiconductor compounds)
73.20.At
(Surface states, band structure, electron density of states)
引用本文:
. [J]. 中国物理快报, 2018, 35(7): 76802-076802.
链接本文:
https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/35/7/076802
或
https://cpl.iphy.ac.cn/CN/Y2018/V35/I7/76802
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2018, Vol. 35 
