Chin. Phys. Lett.  2018, Vol. 35 Issue (7): 076802    DOI: 10.1088/0256-307X/35/7/076802
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**
1State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084
2Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190
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Gaoyuan Jiang, Yang Feng, Weixiong Wu et al  2018 Chin. Phys. Lett. 35 076802
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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.
Received: 08 June 2018      Published: 09 June 2018
PACS: (Semiconductors)  
  73.23.Ad (Ballistic transport)  
  71.20.Nr (Semiconductor compounds)  
  73.20.At (Surface states, band structure, electron density of states)  
Fund: 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, and the Beijing Advanced Innovation Center for Future Chip (ICFC).
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Gaoyuan Jiang
Yang Feng
Weixiong Wu
Shaorui Li
Yunhe Bai
Yaoxin Li
Qinghua Zhang
Lin Gu
Xiao Feng
Ding Zhang
Canli Song
Lili Wang
Wei Li
Xu-Cun Ma
Qi-Kun Xue
Yayu Wang
Ke He
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