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Topological electronic structure and its temperature evolution in antiferromagnetic topological insulator MnBi2Te4

DOI: 10.1103/PhysRevX.9.041040 DOI Help

Authors: Y. j. Chen (Tsinghua University) , L. x. Xu (ShanghaiTech University and CAS-Shanghai Science Research Center; Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences; Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences) , J. h. Li (Tsinghua University) , Y. w. Li (University of Oxford) , H. y. Wang (ShanghaiTech University and CAS-Shanghai Science Research Center; University of Chinese Academy of Sciences) , C. f. Zhang (National University of Defense Technology) , H. Li (Tsinghua University) , Y. Wu (Tsinghua University) , A. j. Liang (ShanghaiTech University and CAS-Shanghai Science Research Center; Advanced Light Source) , C. Chen (ShanghaiTech University and CAS-Shanghai Science Research Center; Advanced Light Source) , S. W. Jung (Diamond Light Source) , C. Cacho (Diamond Light Source) , Y. h. Mao (National University of Defense Technology) , S. Liu (ShanghaiTech University and CAS-Shanghai Science Research Center) , M. x. Wang (ShanghaiTech University and CAS-Shanghai Science Research Center) , Y. f. Guo (ShanghaiTech University and CAS-Shanghai Science Research Center) , Y. Xu (Tsinghua University; Frontier Science Center for Quantum Information, Beijing; RIKEN Center for Emergent Matter Science (CEMS)) , Z. k. Liu (ShanghaiTech University and CAS-Shanghai Science Research Center) , L. x. Yang (Tsinghua University; Frontier Science Center for Quantum Information, Beijing) , Y. l. Chen (Tsinghua University; ShanghaiTech University and CAS-Shanghai Science Research Center; University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review X , VOL 9

State: Published (Approved)
Published: November 2019
Diamond Proposal Number(s): 23648 , 24827

Open Access Open Access

Abstract: The intrinsic magnetic topological insulator MnBi 2 Te 4 exhibits rich topological effects such as quantum anomalous Hall effect and axion electrodynamics. Here, by combining the use of synchrotron and laser light sources, we carry out comprehensive and high-resolution angle-resolved photoemission spectroscopy studies on MnBi 2 Te 4 and clearly identify its topological electronic structure. In contrast to theoretical predictions and previous studies, we observe topological surface states with diminished gap forming a characteristic Dirac cone. We argue that the topological surface states are mediated by multidomains of different magnetization orientations. In addition, the temperature evolution of the energy bands clearly reveals their interplay with the magnetic phase transition by showing interesting differences between the bulk and surface states, respectively. The investigation of the detailed electronic structure of MnBi 2 Te 4 and its temperature evolution provides important insight into not only the exotic properties of MnBi 2 Te 4 , but also the generic understanding of the interplay between magnetism and topological electronic structure in magnetic topological quantum materials.

Diamond Keywords: Ferromagnetism; Antiferromagnetism

Subject Areas: Materials, Physics


Instruments: I05-ARPES

Other Facilities: National Synchrotron Radiation Laboratory (NSRL), China; Shanghai Synchrotron Radiation Facility (SSRF); Advanced Light Source

Added On: 05/12/2019 14:15

Discipline Tags:

Surfaces Quantum Materials Physics Hard condensed matter - structures Magnetism Materials Science

Technical Tags:

Spectroscopy Angle Resolved Photoemission Spectroscopy (ARPES)