Chin. Phys. Lett.  2019, Vol. 36 Issue (11): 117303    DOI: 10.1088/0256-307X/36/11/117303
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Experimental Evidence of Topological Surface States in Mg$_{3}$Bi$_{2}$ Films Grown by Molecular Beam Epitaxy
Tong Zhou1,2,3,4†, Xie-Gang Zhu2,4†, Mingyu Tong5†, Yun Zhang2,4, Xue-Bing Luo2,4, Xiangnan Xie1, Wei Feng2,4, Qiuyun Chen2,4, Shiyong Tan2,4, Zhen-Yu Wang1,3,7**, Tian Jiang1,5, Yuhua Tang1**, Xin-Chun Lai2**, Xuejun Yang1,6
1State Key Laboratory of High Performance Computing, College of Computer, National University of Defense Technology, Changsha 410073
2Science and Technology on Surface Physics and Chemistry Laboratory, Jiangyou 621908
3National Innovation Institute of Defense Technology, Academy of Military Sciences PLA China, Beijing 100010
4Institute of Materials, China Academy of Engineering Physics, Mianyang 621700
5College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073
6Academy of Military Sciences PLA China, Beijing 100010
7Beijing Academy of Quantum Information Sciences, Beijing 100084
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Abstract Nodal line semimetal (NLS) is a new quantum state hosting one-dimensional closed loops formed by the crossing of two bands. The so-called type-II NLS means that these two crossing bands have the same sign in their slopes along the radial direction of the loop, which requires that the crossing bands are either right-tilted or left-tilted at the same time. According to the theoretical prediction, Mg$_{3}$Bi$_{2}$ is an ideal candidate for studying the type-II NLS by tuning its spin-orbit coupling (SOC). High-quality Mg$_{3}$Bi$_{2}$ films are grown by molecular beam epitaxy (MBE). By in-situ angle resolved photoemission spectroscopy (ARPES), a pair of surface resonance bands around the $\bar{{{\it \Gamma}}}$ point are clearly seen. This shows that Mg$_{3}$Bi$_{2}$ films grown by MBE are Mg(1)-terminated by comparing the ARPES spectra with the first principles calculations results. Moreover, the temperature dependent weak anti-localization effect in Mg$_{3}$Bi$_{2}$ films is observed under magneto-transport measurements, which shows clear two-dimensional (2D) $e$–$e$ scattering characteristics by fitting with the Hikami–Larkin–Nagaoka model. Therefore, by combining with ARPES, magneto-transport measurements and the first principles calculations, this work proves that Mg$_{3}$Bi$_{2}$ is a semimetal with topological surface states. This paves the way for Mg$_{3}$Bi$_{2}$ to be used as an ideal material platform to study the exotic features of type-II nodal line semimetals and the topological phase transition by tuning its SOC.
Received: 14 August 2019      Published: 21 October 2019
PACS:  73.20.At (Surface states, band structure, electron density of states)  
  73.20.Fz (Weak or Anderson localization)  
  79.60.Bm (Clean metal, semiconductor, and insulator surfaces)  
  81.10.Aj (Theory and models of crystal growth; physics and chemistry of crystal growth, crystal morphology, and orientation)  
Fund: Supported by the Science Challenge Project under Grant No TZ2016004, the Opening Foundation of State Key Laboratory of High Performance Computing under Grant No 201601-02, the Foundation of President of CAEP under Grant No 201501040, the Natural Science Foundation of Hunan Province under Grant No 2016JJ1021, the National Basic Research Program of China under Grant Nos 2015CB921303 and 2012YQ13012508, the General Program of Beijing Academy of Quantum Information Sciences under Grant No Y18G17, and the Youth Talent Lifting Project under Grant No 17-JCJQ-QT-004.
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Tong Zhou, Xie-Gang Zhu, Mingyu Tong et al  2019 Chin. Phys. Lett. 36 117303
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http://cpl.iphy.ac.cn/10.1088/0256-307X/36/11/117303       OR      http://cpl.iphy.ac.cn/Y2019/V36/I11/117303
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Tong Zhou
Xie-Gang Zhu
Mingyu Tong
Yun Zhang
Xue-Bing Luo
Xiangnan Xie
Wei Feng
Qiuyun Chen
Shiyong Tan
Zhen-Yu Wang
Tian Jiang
Yuhua Tang
Xin-Chun Lai
Xuejun Yang
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