Persistent surface states with diminishing gap in MnBi_(2)Te_(4)/Bi_(2)Te_(3) superlattice antiferromagnetic topological insulator

作     者：Lixuan Xu Yuanhao Mao Hongyuan Wang Jiaheng Li Yujie Chen Yunyouyou Xia Yiwei Li Ding Pei Jing Zhang Huijun Zheng Kui Huang Chaofan Zhang Shengtao Cui Aiji Liang Wei Xia Hao Su Sungwon Jung Cephise Cacho Meixiao Wang Gang Li Yong Xu Yanfeng Guo Lexian Yang Zhongkai Liu Yulin Chen Mianheng Jiang 徐丽璇;毛元昊;王洪远;李佳恒;陈宇杰;夏云悠悠;李一苇;裴鼎;张敬;郑慧君;黄逵;张超凡;崔胜涛;梁爱基;夏威;苏豪;Sungwon Jung;Cephise Cacho;王美晓;李刚;徐勇;郭艳峰;杨乐仙;柳仲楷;陈宇林;江绵恒

作者机构：Center for Excellence in Superconducting ElectronicsState Key Laboratory of Functional Material for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China School of Physical Science and TechnologyShanghaiTech University and CAS-Shanghai Science Research CenterShanghai 201210China ShanghaiTech Laboratory for Topological PhysicsShanghai 200031China University of Chinese Academy of SciencesBeijing 100049China College of Advanced Interdisciplinary StudiesNational University of Defense TechnologyChangsha 410073China State Key Laboratory of Low Dimensional Quantum PhysicsDepartment of PhysicsTsinghua UniversityBeijing 100084China Department of PhysicsClarendon LaboratoryUniversity of OxfordOxford 0X13PUUK Advanced Light SourceLawrence Berkeley National LaboratoryBerkeleyCA 94720USA Diamond Light SourceHarwell CampusDidcot 0X11 ODEUK Frontier Science Center for Quantum InformationBeijing 100084China RIKEN Center for Emergent Matter Science(CEMS)WakoSaitama 351-0198Japan 

出 版 物：《Science Bulletin》 (科学通报（英文版）)

年 卷 期：2020年第65卷第24期

页      面：2086-2093,M0005页

核心收录：

学科分类：08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the National Key Research and Development Program of China (2017YFA0305400, 2017YFA0304600, 2018YFA0307100, and 2018YFA0305603) the National Natural Science Foundation of China (11774190, 11674229, 11634009, 11774427, 51788104, and 11874035) EPSRC Platform Grant (EP/M020517/1) the support from the Shanghai Pujiang Program (17PJ1406200) 

主　　题：Spatially resolved angle-resolved photoemission spectroscopy Electronic band structure Quantum anomalous Hall effect Magnetic topological insulator 

摘      要：Magnetic topological quantum materials(TQMs) provide a fertile ground for the emergence of fascinating topological magneto-electric effects. Recently, the discovery of intrinsic antiferromagnetic(AFM) topological insulator MnBi_(2)Te_(4) that could realize quantized anomalous Hall effect and axion insulator phase ignited intensive study on this family of TQM compounds. Here, we investigated the AFM compound Mn Bi4 Te7 where Bi_(2)Te_(3) and MnBi_(2)Te_(4) layers alternate to form a superlattice. Using spatial-and angleresolved photoemission spectroscopy, we identified ubiquitous(albeit termination dependent) topological electronic structures from both Bi_(2)Te_(3) and MnBi_(2)Te_(4) terminations. Unexpectedly, while the bulk bands show strong temperature dependence correlated with the AFM transition, the topological surface states with a diminishing gap show negligible temperature dependence across the AFM *** with the results of its sister compound MnBi_(2)Te_(4), we illustrate important aspects of electronic structures and the effect of magnetic ordering in this family of magnetic TQMs.