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Large intrinsic anomalous Hall effect in hole-doped ferromagnetic phase MnSb<i><sub>x</sub></i>Bi<sub>2-<i>x</i></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, axion insulator in its 2D thin layers and an ideal Weyl semimetal state in its bulk ferromagnetic (FM) phase1,2. Although several interesting properties, including Chern insulator, axion insulator, and anomalous Hall effect (AHE) in its canted antiferromagnetic phase have been observed, the predicted FM Weyl state remains elusive3-5. In this talk, we will report our magnetotransport studies on MnSbxBi2-xTe4. We will show when the Sb concentration is tuned to be close to a critical concentration where carrier density reaches a minimum, the FM phase under a high field range exhibits a large intrinsic AHE with the anomalous Hall angle reaching 5%. Moreover, the carrier mobility also reaches a maximum at the critical concentration. All these features are possibly associated with the long-sought ideal Weyl state.

1D. Zhang et al., Phys. Rev. Lett. 122, 206401 (2019)
2J. Li et al., Sci. Adv. 5, eaaw5685 (2019)
3Y. Deng et al., arXiv:1904.11468
4C. Liu et al., arXiv:1905.00715
5S. H. Lee et al., Phys. Rev. Research 1, 012011 (2019)

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Presenters

  • Seng Huat Lee

    2D Crystal Consortium, Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA, Physics, The Pennsylvania State University, Pennsylvania State University, MRI, Penn State University

Authors

  • Seng Huat Lee

    2D Crystal Consortium, Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA, Physics, The Pennsylvania State University, Pennsylvania State University, MRI, Penn State University

  • Yanglin Zhu

    Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802, USA, Physics, The Pennsylvania State University, Department of Physics, Pennsylvania State University, Pennsylvania State University, Penn State University, Physics, Penn State University, Pennsylvania state University

  • Lujin Min

    Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania, 16802, USA, Pennsylvania State University, Pennsylvania state University

  • Verlinde Katrina

    Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania, 16802, USA

  • Jingyang He

    Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania, 16802, USA

  • David E Graf

    Florida State University, National High Magnetic Field Laboratory, Florida State University, Department of Physics, National High Magnetic Field Laboratory, Florida State University, Florida, USA, National High Magnetic Field Laboratory, National High Magnetic Field Lab, Florida State University, National High Magnetic Field Laboratory and Department of Physics, Florida State University, Florida State Univ, Natl High Magnetic Field Lab, National High Magnetic Field Lab, Tallahassee, FL 32310, USA, National High Magnetic Field Laboratory, 1800 E. Paul Dirac Drive, Tallahassee, FL 32310, USA, National High Magnetic Field Laboratory-Florida State University, National High Magnetic Field Laboratory, Tallahassee, FL, NHMFL, Florida State University, NHMFL

  • Ronald Redwing

    Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania, 16802, USA, MRI, Penn State University

  • Zhiqiang Mao

    Pennsylvania State University, Tulane University, Physics, Pennsylvania State University, Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802, USA, Physics, The Pennsylvania State University, Department of Physics, Pennsylvania State University, Penn State University, Physics, Penn State University, The Pennsylvania State University