Fermi-arc superconductivity in Dirac Semimetal Cd<sub>3</sub>As<sub>2</sub>

ORAL

Abstract

Cd3As2 is a three-dimensional Dirac semimetal with separated Dirac points in momentum space which are connected by Fermi arcs. In spite of their extensive studies via transport and spectroscopic approaches, the coupling of Fermi-arc states to superconductivity remains elusive. Here, we report the observation of proximity-induced Fermi-arc superconductivity in SC/Cd3As2 hybrid structures. The proximity gap in Fermi arcs is comparable to the parent superconductor which exhibits a flat conductance plateau in differential conductance spectra. The proximity-induced pairing gap on bulk states, however, is small and manifests itself as a zero-bias broad peak (ZBBP). Corroborated with theory, we further unveil a systematic suppression of the ZBBP and an appearance of conductance plateau when the Fermi-arc states become gradually dominant.

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Presenters

  • Ce Huang

    • Fudan University

Authors

  • Ce Huang

    • Fudan University

  • Tong Zhou

    • The Hong Kong University of Science and Technology

  • Kam Tuen Law

    • Physics, Hong Kong University of Science and Technology
    • Department of Physics, Hong Kong University of Science and Technology
    • Physics, HKUST
    • Hong Kong University of Science and Technology
    • The Hong Kong University of Science and Technology

  • Faxian Xiu

    • Fudan University
    • State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China