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Native defects in Antiferromagnetic Topological Insulator MnBi<sub>2</sub>Te<sub>4</sub>

ORAL

Abstract

The coupling of topological electronic states and magnetism can lead to various exotic phenomena such as quantum anomalous Hall effect, axion insulating state, etc. Recently, single crystals and thin films of MnBi2Te4 have been successfully synthesized and it has been shown to be a promising candidate of antiferromagnetic topological insulator [1, 2]. It is crucial to understand and control the defects in this material as they affect its electronic and magnetic properties. In this talk, I will present our study of the native defects in single-crystalline MnBi2Te4 using scanning tunneling microscopy (STM). We identify the dominant defects, MnBi antisites in the second layer of Bi, which may impact the magnetic properties of MnBi2Te4 [3, 4, 5]. In addition, we observe another interesting defects with pronounced defect states near the conduction band edge.

1. Otrokov, M. M. et al. Phys. Rev. Lett. 122, 107202 (2019).
2. Gong, Y. et al. Chin. Phys. Lett. 36, 076801 (2019).
3. Yan, J.-Q. et al. Phys. Rev. Mater. 3, 064202 (2019)
4. Yan, J.-Q. et al. arXiv:1905.00400 (2019).
5. Sass, P. M. et al. arXiv:1910.06488 (2019).

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Presenters

  • Zengle Huang

    Department of Physics and Astronomy, Rutgers University, New Brunswick, Department of Physics and Astronomy, Rutgers University

Authors

  • Zengle Huang

    Department of Physics and Astronomy, Rutgers University, New Brunswick, Department of Physics and Astronomy, Rutgers University

  • Jiaqiang Yan

    Materials Science and Engineering, The University of Tennessee, Oak Ridge National Lab, Oak Ridge National Laboratory, Materials Science and Technology Division, Oak Ridge National Laboratory, Materials Science and Technology Division, Oak Ridge National Lab, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA

  • Weida Wu

    Physics and Astronomy, Rutgers University, New Brunswick, Department of Physics and Astronomy, Rutgers University, Department of Physics and Astronomy, Rutgers, The State University of New Jersey, Department of Physics and Astronomy, Rutgers University, New Brunswick, Rutgers University, New Brunswick