Topological Electronic Structure and Its Temperature Evolution in Antiferromagnetic Topological Insulator MnBi2Te4

By Yujie Chen, Lixuan Xu, Jiaheng Li, Yiwei Li, Hongyuan Wang, Chaofan Zhang, Hao Li, Yang Wu, A. Liang, Cheng Chen and 10 more. Physical Review X, 2019

243 citations recorded by the source corpus.

The intrinsic magnetic topological insulator MnBi2Te4 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 MnBi2Te4 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 MnBi2Te4 and its temperature evolution provides important insight into not only the exotic properties of MnBi2Te4, but also the generic understanding of the interplay between magnetism and topological electronic structure in magnetic topological quantum materials.

Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/02322a25cdece546cf57f480171f1b59385cfd30

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In Atomic and Molecular Physics, and Optics

1. H. Ding
2. T. Qian
3. H. Weng

In Condensed Matter Physics

1. H. Weng
2. T. Qian
3. H. Ding

In Materials Chemistry

1. H. Ding
2. T. Qian
3. H. Weng
4. Yuanfeng Xu

Citations in the corpus

• Dirac Surface States in Intrinsic Magnetic Topological Insulators EuSn2As2 and MnBi2nTe3n+1 (2019, background): “tronic states are heavily involved in the magnetic order, which may be critical to realize topological quantum phenomena at higher temperatures. Note added: We become aware of similar studies in Ref. [44, 45, 46] and the updated version of Ref. [26] showing the Dirac SSs in MnBi2Te4 when finalizing ”
• Angle-resolved photoemission studies of quantum materials (2020, unknown): “In optimally doped Bi-2212, the antinodal dispersion gradually develops a spectral weight depression around 70 meV below the superconducting pairing temperature (Fig.”