Intrinsic magnetic topological insulator phases in the Sb doped MnBi2Te4 bulks and thin flakes

Bo Chen, Fucong Fei (), Dongqin Zhang, Bo Zhang, Wanling Liu, Shuai Zhang, Pengdong Wang, Boyuan Wei, Yong Zhang, Zewen Zuo, Jingwen Guo, Qianqian Liu, Zilu Wang, Xuchuan Wu, Junyu Zong, Xuedong Xie, Wang Chen, Zhe Sun, Shancai Wang, Yi Zhang, Minhao Zhang, Xuefeng Wang, Fengqi Song (), Haijun Zhang (), Dawei Shen () and Baigeng Wang
Additional contact information
Bo Chen: Nanjing University
Fucong Fei: Nanjing University
Dongqin Zhang: Nanjing University
Bo Zhang: University of Science and Technology of China
Wanling Liu: ShanghaiTech University
Shuai Zhang: Nanjing University
Pengdong Wang: University of Science and Technology of China
Boyuan Wei: Nanjing University
Yong Zhang: Nanjing University
Zewen Zuo: Nanjing University
Jingwen Guo: Nanjing University
Qianqian Liu: Nanjing University
Zilu Wang: Renmin University of China
Xuchuan Wu: Renmin University of China
Junyu Zong: Nanjing University
Xuedong Xie: Nanjing University
Wang Chen: Nanjing University
Zhe Sun: University of Science and Technology of China
Shancai Wang: Renmin University of China
Yi Zhang: Nanjing University
Minhao Zhang: Nanjing University
Xuefeng Wang: Atomic Manufacture Institute (AMI)
Fengqi Song: Nanjing University
Haijun Zhang: Nanjing University
Dawei Shen: Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences
Baigeng Wang: Nanjing University

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Magnetic topological insulators (MTIs) offer a combination of topologically nontrivial characteristics and magnetic order and show promise in terms of potentially interesting physical phenomena such as the quantum anomalous Hall (QAH) effect and topological axion insulating states. However, the understanding of their properties and potential applications have been limited due to a lack of suitable candidates for MTIs. Here, we grow two-dimensional single crystals of Mn(SbxBi(1-x))2Te4 bulk and exfoliate them into thin flakes in order to search for intrinsic MTIs. We perform angle-resolved photoemission spectroscopy, low-temperature transport measurements, and first-principles calculations to investigate the band structure, transport properties, and magnetism of this family of materials, as well as the evolution of their topological properties. We find that there exists an optimized MTI zone in the Mn(SbxBi(1-x))2Te4 phase diagram, which could possibly host a high-temperature QAH phase, offering a promising avenue for new device applications.

Date: 2019
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DOI: 10.1038/s41467-019-12485-y

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