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Proximity-magnetized quantum spin Hall insulator: monolayer 1 T’ WTe2/Cr2Ge2Te6

Author

Listed:
  • Junxue Li

    (University of California
    Southern University of Science and Technology)

  • Mina Rashetnia

    (University of California)

  • Mark Lohmann

    (University of California)

  • Jahyun Koo

    (Weizmann Institute of Science)

  • Youming Xu

    (University of California)

  • Xiao Zhang

    (Peking University)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Shuang Jia

    (Peking University)

  • Xi Chen

    (University of California)

  • Binghai Yan

    (Weizmann Institute of Science)

  • Yong-Tao Cui

    (University of California)

  • Jing Shi

    (University of California)

Abstract

Van der Waals heterostructures offer great versatility to tailor unique interactions at the atomically flat interfaces between dissimilar layered materials and induce novel physical phenomena. By bringing monolayer 1 T’ WTe2, a two-dimensional quantum spin Hall insulator, and few-layer Cr2Ge2Te6, an insulating ferromagnet, into close proximity in an heterostructure, we introduce a ferromagnetic order in the former via the interfacial exchange interaction. The ferromagnetism in WTe2 manifests in the anomalous Nernst effect, anomalous Hall effect as well as anisotropic magnetoresistance effect. Using local electrodes, we identify separate transport contributions from the metallic edge and insulating bulk. When driven by an AC current, the second harmonic voltage responses closely resemble the anomalous Nernst responses to AC temperature gradient generated by nonlocal heater, which appear as nonreciprocal signals with respect to the induced magnetization orientation. Our results from different electrodes reveal spin-polarized edge states in the magnetized quantum spin Hall insulator.

Suggested Citation

  • Junxue Li & Mina Rashetnia & Mark Lohmann & Jahyun Koo & Youming Xu & Xiao Zhang & Kenji Watanabe & Takashi Taniguchi & Shuang Jia & Xi Chen & Binghai Yan & Yong-Tao Cui & Jing Shi, 2022. "Proximity-magnetized quantum spin Hall insulator: monolayer 1 T’ WTe2/Cr2Ge2Te6," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-32808-w
    DOI: 10.1038/s41467-022-32808-w
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    References listed on IDEAS

    as
    1. Cheng Gong & Lin Li & Zhenglu Li & Huiwen Ji & Alex Stern & Yang Xia & Ting Cao & Wei Bao & Chenzhe Wang & Yuan Wang & Z. Q. Qiu & R. J. Cava & Steven G. Louie & Jing Xia & Xiang Zhang, 2017. "Discovery of intrinsic ferromagnetism in two-dimensional van der Waals crystals," Nature, Nature, vol. 546(7657), pages 265-269, June.
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