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Universal gapless Dirac cone and tunable topological states in (MnBi2Te4)m(Bi2Te3)n heterostructures

Yong Hu, Lixuan Xu, Mengzhu Shi, Aiyun Luo, Shuting Peng, Z. Y. Wang, J. J. Ying, T. Wu, Z. K. Liu, C. F. Zhang, Y. L. Chen, G. Xu, X.-H. Chen, and J.-F. He
Phys. Rev. B 101, 161113(R) – Published 23 April 2020
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Abstract

The newly discovered magnetic topological insulators (MnBi2Te4)m(Bi2Te3)n are predicted to be a versatile platform for exploring novel topological states. Here, we report angle-resolved photoemission spectroscopy studies on a series of (MnBi2Te4)m(Bi2Te3)n heterostructures. An unexpected but universal gapless Dirac cone is observed on the (MnBi2Te4) terminated (0001) surfaces in all systems, indicating an altered magnetic structure near the surface. The specific band dispersion of the surface states, presumably dominated by the top surface, is found to be sensitive to different stackings of the underlying MnBi2Te4 and Bi2Te3 layers. Our results suggest the high tunability of both magnetic and electronic structures of the topological surface states in (MnBi2Te4)m(Bi2Te3)n heterostructures, which is essential in realizing and manipulating various topological states.

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  • Received 17 December 2019
  • Accepted 18 March 2020

DOI:https://doi.org/10.1103/PhysRevB.101.161113

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yong Hu1,*, Lixuan Xu2,*, Mengzhu Shi1,*, Aiyun Luo3,*, Shuting Peng1, Z. Y. Wang1, J. J. Ying1, T. Wu1, Z. K. Liu2, C. F. Zhang2,4, Y. L. Chen2,5, G. Xu3, X.-H. Chen1,†, and J.-F. He1,†

  • 1Hefei National Laboratory for Physical Sciences at the Microscale, Department of Physics and CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
  • 2School of Physical Science and Technology and ShanghaiTech Laboratory for Topological Physics, ShanghaiTech University, Shanghai 201210, China
  • 3Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
  • 4College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
  • 5Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom

  • *These authors contributed equally to this work.
  • Correspondence and requests for materials should be addressed to chenxh@ustc.edu.cn; jfhe@ustc.edu.cn

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Issue

Vol. 101, Iss. 16 — 15 April 2020

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