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Experimental evidence of the field-induced Weyl state in Mn(Bi<sub>1-<i>x</i></sub>Sb<i><sub>x</sub></i>)<sub>2</sub>Te<sub>4</sub>

ORAL

Abstract

MnBi2Te4, an intrinsic magnetic topological insulator, has recently been predicted to possess a variety of topological quantum states, including quantum anomalous Hall insulator (QAHI), axion insulator in its 2D thin layers, and an ideal Weyl semimetal state in its bulk ferromagnetic (FM) phase1-3. QAHI and axion insulator in MnBi2Te4 thin layers have been experimentally demonstrated4,5, but the predicted FM Weyl state remains elusive. In this talk, we report the experimental evidence of the field-induced Weyl state in Mn(Bi1-xSbx)2Te46. The characteristics of the expected Weyl state were observed when the system is tuned to be lightly hole-doped via Sb substitution for Bi and is manifested by a field-driven electronic phase transition as well as large intrinsic anomalous Hall effect in the FM phase. Our results establish a promising platform for exploring the physics underlying the long-sought, ideal TRS breaking type-II WSM.

1M. M. Otrokov et al., Nature 576, 416 (2019)
2D. Zhang et al., Phys. Rev. Lett. 122, 206401 (2019)
3J. Li et al., Sci. Adv. 5, eaaw5685 (2019)
4Y. Deng. et al., Science 367, 895 (2020)
5C. Liu et al., Nat. Mater. 19, 522 (2020)
6S. H. Lee et al., arXiv:2002.10683

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Presenters

  • Seng Huat Lee

    Pennsylvania State University, Department of Physics, Pennsylvania State University, Physics, The Pennsylvania State University, 2D Crystal Consortium, Materials Research Institute, Penn State University, Materials Research Institute, Pennsylvania State University

Authors

  • Seng Huat Lee

    Pennsylvania State University, Department of Physics, Pennsylvania State University, Physics, The Pennsylvania State University, 2D Crystal Consortium, Materials Research Institute, Penn State University, Materials Research Institute, Pennsylvania State University

  • David E Graf

    National High Magnetic Field Laboratory, Florida State University, National High Magnetic Field Lab, Florida State University, National High Magnetic Field Laboratory, Tallahassee and Florida State University, National High Magnetic Field Laboratory, Florida State University, National High Magnetic Field Laboratory (FSU), Department of Physics, Florida State University, National High Magnetic Field Laboratory and Department of Physics, Florida State University, National High Magnetic Field Lab, National High Magnetic Field Laboratory, Tallahassee, FL, CMS, National High Magnetic Laboratory

  • Yanglin Zhu

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

  • Hemian Yi

    Pennsylvania State University, Department of Physics, Pennsylvania State University

  • Samuel Ciocys

    University of California, Berkeley, Physics, University of California, Berkeley, Lawrence Berkeley National Laboratory, Department of Physics, University of California Berkeley

  • Eun Sang Choi

    National High Magnetic Field Laboratory, Florida State University, National High Magnetic Field Laboratory, National High Magnetic Field Laboratory and Department of Physics, Florida State University, National High Magnetic Field Lab, Physics, Florida State University, National High Field Magnet Laboratory, Florida Sate University

  • Rabindra Basnet

    University of Arkansas, Department of Physics, University of Arkansas

  • Arash Fereidouni

    University of Arkansas, Physics, University of Arkansas, Department of Physics, University of Arkansas

  • Aaron Wegner

    University of Arkansas, Department of Physics, University of Arkansas

  • Yifan Zhao

    Pennsylvania State University, Department of Physics, Pennsylvania State University

  • Lujin Min

    Department of Material Science and Engineering, Penn State University, Department of Physics, Pennsylvania State University, Physics, Pennsylvania State University, Pennsylvania State University, Department of Materials Science and Engineering, Pennsylvania State University

  • Katrina Verlinde

    Department of Materials Science and Engineering, Pennsylvania State University

  • Jingyang He

    Department of Materials Science and Engineering, Pennsylvania State University

  • Ronald Dean Redwing

    Department of Materials Science and Engineering, Pennsylvania State University, 2D Crystal Consortium, Materials Research Institute, Penn State University, Materials Research Institute, Pennsylvania State University

  • Venkatraman Gopalan

    Pennsylvania State University, Material Science and Engineering, Pennsylvania State University, Department of Material Science and Engineering, Penn State University, Department of Materials Science and Engineering, Pennsylvania State University, Materials Science and Engineering, Pennsylvania State University

  • Hugh O. H. Churchill

    University of Arkansas, Department of Physics, University of Arkansas, Physics, University of Arkansas

  • Alessandra Lanzara

    University of California, Berkeley, Department of Physics, University of California, Physics, University of California, Berkeley, Lawrence Berkeley National Laboratory, Department of Physics, University of California Berkeley, Physics, University of California Berkeley, Physics, UC Berkeley

  • NITIN SAMARTH

    Pennsylvania State University, Department of Physics, Pennsylvania State University

  • Cui-Zu Chang

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

  • Zhiqiang Mao

    Pennsylvania State University, Department of Physics, Penn State University, The Pennsylvania State University, Penn State University, Physics, Penn State University, Department of Physics, Pennsylvania State University, Department of Physics, The Pennsylvania State University, Physics, The Pennsylvania State University, Physics, Pennsylvania State University, Department of Materials Science and Engineering, Pennsylvania State University