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Proximity-induced surface superconductivity in Dirac semimetal Cd3As2

Author

Listed:
  • Ce Huang

    (Fudan University
    Fudan University)

  • Benjamin T. Zhou

    (The Hong Kong University of Science and Technology, Clear Water Bay)

  • Huiqin Zhang

    (Fudan University
    Fudan University)

  • Bingjia Yang

    (Fudan University
    Fudan University)

  • Ran Liu

    (Fudan University
    Fudan University)

  • Hanwen Wang

    (Chinese Academy of Sciences)

  • Yimin Wan

    (Fudan University
    Fudan University)

  • Ke Huang

    (Peking University)

  • Zhiming Liao

    (The University of Queensland)

  • Enze Zhang

    (Fudan University
    Fudan University)

  • Shanshan Liu

    (Fudan University
    Fudan University)

  • Qingsong Deng

    (University of Technology)

  • Yanhui Chen

    (University of Technology)

  • Xiaodong Han

    (University of Technology)

  • Jin Zou

    (The University of Queensland
    The University of Queensland)

  • Xi Lin

    (Peking University)

  • Zheng Han

    (Chinese Academy of Sciences)

  • Yihua Wang

    (Fudan University
    Fudan University)

  • Kam Tuen Law

    (The Hong Kong University of Science and Technology, Clear Water Bay)

  • Faxian Xiu

    (Fudan University
    Fudan University
    Collaborative Innovation Center of Advanced Microstructures)

Abstract

Cd3As2 is a three-dimensional Dirac semimetal with separated Dirac points in momentum space. In spite of extensive transport and spectroscopic studies on its exotic properties, the evidence of superconductivity in its surface states remains elusive. Here, we report the observation of proximity-induced surface superconductivity in Nb/Cd3As2 hybrid structures. Our four-terminal transport measurement identifies a pronounced proximity-induced pairing gap (gap size comparable to Nb) on the surfaces, which exhibits a flat conductance plateau in differential conductance spectra, consistent with our theoretical simulations. The surface supercurrent from Nb/Cd3As2/Nb junctions is also achieved with a Fraunhofer/SQUID-like pattern under out-of-plane/in-plane magnetic fields, respectively. The resultant mapping shows a predominant distribution on the top and bottom surfaces as the bulk carriers are depleted, which can be regarded as a higher dimensional analog of edge supercurrent in two-dimensional quantum spin Hall insulators. Our study provides the evidence of surface superconductivity in Dirac semimetals.

Suggested Citation

  • Ce Huang & Benjamin T. Zhou & Huiqin Zhang & Bingjia Yang & Ran Liu & Hanwen Wang & Yimin Wan & Ke Huang & Zhiming Liao & Enze Zhang & Shanshan Liu & Qingsong Deng & Yanhui Chen & Xiaodong Han & Jin Z, 2019. "Proximity-induced surface superconductivity in Dirac semimetal Cd3As2," Nature Communications, Nature, vol. 10(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-10233-w
    DOI: 10.1038/s41467-019-10233-w
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    Cited by:

    1. Le Duc Anh & Keita Ishihara & Tomoki Hotta & Kohdai Inagaki & Hideki Maki & Takahiro Saeki & Masaki Kobayashi & Masaaki Tanaka, 2024. "Large superconducting diode effect in ion-beam patterned Sn-based superconductor nanowire/topological Dirac semimetal planar heterostructures," Nature Communications, Nature, vol. 15(1), pages 1-8, December.

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