Chin. Phys. Lett.  2019, Vol. 36 Issue (7): 076801    DOI: 10.1088/0256-307X/36/7/076801
CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
Experimental Realization of an Intrinsic Magnetic Topological Insulator
Yan Gong1, Jingwen Guo1, Jiaheng Li1, Kejing Zhu1, Menghan Liao1, Xiaozhi Liu2, Qinghua Zhang2, Lin Gu2, Lin Tang1, Xiao Feng1, Ding Zhang1,3,4, Wei Li1,4, Canli Song1,4, Lili Wang1,4, Pu Yu1,4, Xi Chen1,4, Yayu Wang1,3,4, Hong Yao4,5, Wenhui Duan1,3,4, Yong Xu1,4,6**, Shou-Cheng Zhang7, Xucun Ma1,4, Qi-Kun Xue1,3,4**, Ke He1,3,4**
1State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084
2Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190
3Beijing Academy of Quantum Information Sciences, Beijing 100193
4Collaborative Innovation Center of Quantum Matter, Beijing 100084
5Institute for Advanced Study, Tsinghua University, Beijing 100084
6RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
7Stanford Center for Topological Quantum Physics, Department of Physics, Stanford University, Stanford, California 94305-4045, USA
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Yan Gong, Jingwen Guo, Jiaheng Li et al  2019 Chin. Phys. Lett. 36 076801
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Abstract An intrinsic magnetic topological insulator (TI) is a stoichiometric magnetic compound possessing both inherent magnetic order and topological electronic states. Such a material can provide a shortcut to various novel topological quantum effects but remained elusive experimentally for a long time. Here we report the experimental realization of thin films of an intrinsic magnetic TI, MnBi$_{2}$Te$_{4}$, by alternate growth of a Bi$_{2}$Te$_{3}$ quintuple layer and a MnTe bilayer with molecular beam epitaxy. The material shows the archetypical Dirac surface states in angle-resolved photoemission spectroscopy and is demonstrated to be an antiferromagnetic topological insulator with ferromagnetic surfaces by magnetic and transport measurements as well as first-principles calculations. The unique magnetic and topological electronic structures and their interplays enable the material to embody rich quantum phases such as quantum anomalous Hall insulators and axion insulators at higher temperature and in a well-controlled way.
Received: 27 May 2019      Published: 04 June 2019
PACS:  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)  
Fund: Supported by the Ministry of Science and Technology of China, the National Science Foundation of China, and the Beijing Advanced Innovation Center for Future Chip (ICFC).
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http://cpl.iphy.ac.cn/10.1088/0256-307X/36/7/076801       OR      http://cpl.iphy.ac.cn/Y2019/V36/I7/076801
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Yan Gong
Jingwen Guo
Jiaheng Li
Kejing Zhu
Menghan Liao
Xiaozhi Liu
Qinghua Zhang
Lin Gu
Lin Tang
Xiao Feng
Ding Zhang
Wei Li
Canli Song
Lili Wang
Pu Yu
Xi Chen
Yayu Wang
Hong Yao
Wenhui Duan
Yong Xu
Shou-Cheng Zhang
Xucun Ma
Qi-Kun Xue
Ke He
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