Magnetic proximity and nonreciprocal current switching in a monolayer WTe<sub>2</sub> helical edge

ORAL

Abstract

The introduction of magnetic order into topological band structure gives to new phenomena such as proximity effect and nonreciprocal magnetoelectric effects. We couple the helical edges states in a 2D topological insulator, monolayer WTe2, to a 2D layered antiferromagnet, CrI3. We find that the edge conductance is sensitive to the magnetization state of the CrI3, and the coupling can be understood in terms of an exchange field from the nearest and next-nearest CrI3 layers that produces a gap in the helical edge state. We also find that the nonlinear edge conductance depends on the magnetization of the nearest CrI3 layer relative to the current direction. At low temperatures this produces an extraordinarily large nonreciprocal current that is switched by changing the antiferromagnetic state of the CrI3.

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Presenters

  • Wenjin Zhao

    • University of Washington

Authors

  • Wenjin Zhao

    • University of Washington

  • Zaiyao Fei

    • University of Washington
    • Physics, University of Washington

  • Tiancheng Song

    • University of Washington

  • Han Kyou Choi

    • University of Washington

  • Tauno A Palomaki

    • University of Washington

  • Bosong Sun

    • University of Washington

  • Paul Malinowski

    • University of Washington

  • Michael McGuire

    • Oak Ridge National Laboratory
    • Materials Science and Technology Division, Oak Ridge National Laboratory
    • Oak Ridge National Lab
    • Materials Science Division, Oak Ridge National Laboratory

  • Jiun-Haw Chu

    • University of Washington
    • Department of Physics, University of Washington
    • Physics, University of Washington

  • Xiaodong Xu

    • University of Washington
    • Physics, University of Washington

  • David Cobden

    • University of Washington
    • Physics, University of Washington