Anomalous Hall Effect in Intrinsic Antiferromagnetic Topological Insulator MnBi2Te4

ORAL

Abstract

MnBi2Te4 has recently been predicted to be an intrinsic antiferromagnetic topological insulator (AFMTI)1. This material is also predicted to show ferromagnetism if its dimensionality is reduced to 2D and support other topological states, including type-II magnetic Weyl semimetal state under magnetic fields and Majorana fermions at the interface with a superconductor. Its surface states and magnetic phase transition have been experimentally observed in both bulk2 and thin-film samples3. The material provides an excellent platform to study various exotic physics as well as the realization of the quantum anomalous Hall effect at higher temperatures. Here, we report the synthesis of high-quality bulk single crystals of MnBi2Te4 by melt-growth technique. Magnetic-transport measurements on bulk samples demonstrated the first observation of the anomalous Hall effect.

1J. Li et al., arXiv:1808.08608 (2018)
2M. M. Otrokov et al., arXiv: 1809.07389 (2018)
3Y. Gong et al., arXiv:1809.07926 (2018)

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Presenters

  • Seng Huat Lee

    Pennsylvania State University, 2D Crystal Consortium, Materials Research Institute, The Pennsylvania State University, The Pennsylvania State University

Authors

  • Seng Huat Lee

    Pennsylvania State University, 2D Crystal Consortium, Materials Research Institute, The Pennsylvania State University, The Pennsylvania State University

  • Yanglin Zhu

    Department of Physics and Engineering Physics, Tulane University, Tulane University, Physics and Engineering Physics, Tulane University

  • Yu Wang

    Department of Physics, The Pennsylvania State University, Physics, Pennsylvania State University

  • Zhiqiang Mao

    Department of Physics, The Pennsylvania State University, Pennsylvania State University, Physics, Pennsylvania State University, Physics, Pennsylvania State Univ