Dirac Surface States in Intrinsic Magnetic Topological Insulators EuSn 2 As 2 and MnBi 2 n Te 3 n + 1

Year: 2019

Type: article

Abstract: In magnetic topological insulators (TIs), the interplay between magnetic order and nontrivial topology can induce fascinating topological quantum phenomena, such as the quantum anomalous Hall effect, chiral Majorana fermions, and axion electrodynamics.Recently, a great deal of attention has been focused on the intrinsic magnetic TIs, where disorder effects can be eliminated to a large extent, which is expected to facilitate the emergence of topological quantum phenomena.Despite intensive efforts, experimental evidence of the topological surface states (SSs) remains elusive.Here, by combining first-principles calculations and angle-resolved photoemission spectroscopy (ARPES) experiments, we reveal that EuSn 2 As 2 is an antiferromagnetic TI with the observation of Dirac SSs consistent with our prediction.We also observe nearly gapless Dirac SSs in antiferromagnetic TIs MnBi 2n Te 3nþ1 (n ¼ 1 and 2), which are absent in previous ARPES results.These results provide clear evidence for nontrivial topology of these intrinsic magnetic TIs.Furthermore, we find that the topological SSs show no observable changes across the magnetic transition within the experimental resolution, indicating that the magnetic order has a quite small effect on the topological SSs, which can be attributed to weak hybridization between the localized

Source: Physical Review X

DOI: 10.1103/physrevx.9.041039

Authors: Hang Li, Shun-Ye Gao, Shao-Feng Duan, Yuan-Feng Xu, Ke-Jia Zhu, Shang-Jie Tian, Jia-Cheng Gao, Wen-Hui Fan, Zhi-Cheng Rao, Jie-Rui Huang, Jia-Jun Li, Da-Yu Yan, Zheng-Tai Liu, Wan-Ling Liu, Yao-Bo Huang, Yu-Liang Li, Yi Liu, Guo-Bin Zhang, Peng Zhang, Takeshi Kondo, Shik Shin, He-Chang Lei, You-Guo Shi, Wen-Tao Zhang, Hong-Ming Weng, Tian Qian, Hong Ding

Institutions: Chinese Academy of Sciences, Institute of Physics, University of Chinese Academy of Sciences, Shanghai Jiao Tong University, Shenyang National Laboratory for Materials Science, Max Planck Institute of Microstructure Physics, Renmin University of China, Shanghai Institute of Microsystem and Information Technology, State Key Laboratory of Functional Materials for Informatics, Shanghai Advanced Research Institute, Shanghai Synchrotron Radiation Facility, University of Science and Technology of China, National Synchrotron Radiation Laboratory, The Institute for Solid State Physics, The University of Tokyo, National Institute of Advanced Industrial Science and Technology, Songshan Lake Materials Laboratory

Language: English

Topic: Topological Materials and Phenomena

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $4,200

Funders: National Natural Science Foundation of China, Chinese Academy of Sciences, Ministry of Science and Technology of the People's Republic of China, Renmin University of China, Natural Science Foundation of Beijing Municipality, Beijing Municipal Science and Technology Commission, K. C. Wong Education Foundation, Japan Society for the Promotion of Science, Fundamental Research Funds for the Central Universities, Science Challenge Project

OpenAlex ID: W2958831258