Topological Electronic Structure and Its Temperature Evolution in Antiferromagnetic Topological Insulators
ORAL
Abstract
Magnetic topological insulators represent a novel state of topological quantum materials with unique blends of non-trivial band topology and magnetism. Recently, Intrinsic magnetic topological insulator MnBi2Te4 is shown to exhibit rich topological effects such as quantum anomalous Hall effect and axion electrodynamics, which attracts tremendous research interests. Here, we carried out comprehensive and high-resolution angle-resolved photoemission spectroscopy studies on MnBi2Te4, and identified its topological electronic structure. In contrast to theoretical predictions and previous studies, we observe topological surface states with a diminished gap forming a characteristic Dirac cone. In addition, the temperature evolution of the energy bands reveals their interplay with the magnetic phase transition by showing interesting differences between the bulk and surface states, respectively. Our results provide important insights into not only the exotic properties of MnBi2Te4, but also the generic understanding of the interplay between magnetism and topological electronic structure in magnetic TQMs.
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Presenters
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Lexian Yang
Tsinghua University, Department of Physics, Tsinghua University
Authors
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Lexian Yang
Tsinghua University, Department of Physics, Tsinghua University
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Zhongkai Liu
ShanghaiTech University
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Yong Xu
Tsinghua University, Department of Physics, Tsinghua University, Collaborative Innovation Center of Quantum Matter and State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, China
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Yulin Chen
Oxford University, University of Oxford, Physics, University of Oxford, Tsinghua University, Department of Physics, Oxford university, Clarendon Laboratory, Department of Physics, University of Oxford, Department of Physics, University of Oxford