Pressure-tuned interlayer coupling of the magnetic topological insulators MnBi<sub>2</sub>Te<sub>4</sub>(Bi<sub>2</sub>Te<sub>3</sub>)<sub>n</sub> (n=1,2)

ORAL

Abstract


Magnetic topological insulators with nontrivial topological band structure and broken time-reveal symmetry provide an ideal platform for exploring exotic quantum phenomena, such as quantum anomalous Hall effect (QAHE), axion insulator state and Majarona mode. Recently, MnBi2Te4 was discovered as the first intrinsic antiferromagnetic topological insulator. However, due to the large antiferromagnetic interlayer coupling, strong external magnetic field is needed to fully polarize the magnetic moment to achieve QAHE. By inserting one or two Bi2Te3 layers into the adjacent MnBi2Te4 septuple layers, the antiferromagnetic interlayer coupling can be greatly reduced. Using hydrostatic pressure to further modulate the interlayer interaction, we study the transport properties of the MnBi2Te4(Bi2Te3)n (n=1,2) bulk crystals and investigate the pressure tuned interlayer coupling in detail.

Presenters

  • Jifeng Shao

    • Southern University of Science and Technology

Authors

  • Jifeng Shao

    • Southern University of Science and Technology

  • Xiao-Ming Ma

    • physics, Southern University of Science and Technology
    • Physics, Southern University of Science and Technology
    • Southern University of Science and Technology

  • Jingyuan Li

    • Southern University of Science and Technology

  • Yichen Sun

    • Southern University of Science and Technology

  • Rui'e Lu

    • Physics, Southern University of Science and Technology
    • Southern University of Science and Technology

  • Meng Zeng

    • Physics, Southern University of Science and Technology
    • Southern University of Science and Technology

  • Yujie Hao

    • Southern University of Science and Technology

  • Chang Liu

    • physics, Southern University of Science and Technology
    • Physics, Southern University of Science and Technology
    • Southern University of Science and Technology

  • Qihang Liu

    • physics, Southern University of Science and Technology
    • Physics, Shenzhen Institute for Quantum Science and Technology
    • Physics, Southern University of Science and Technology
    • Southern University of Science and Technology
    • Department of Physics, Southern University of Science and Technology

  • Yue Zhao

    • physics, Southern University of Science and Technology
    • Southern University of Science and Technology