Superconductivity Proximity Effect on Bulk and Surface States of Bi2Se3 Revealed by Conductance Peak and Plateau

ORAL

Abstract

We measured the transport properties of Bi2Se3/NbSe2 junctions. The resistance drops twice around temperatures of 7K and 2K respectively, indicating proximity-induced superconductivity in Bi2Se3. Further conductance measurements show plateaus in the superconducting gap of NbSe2, and a peak near zero bias. By numerical simulation with a tight-binding model, we found that the plateau is due to a quite transparent interface between Bi2Se3 and NbSe2 and thus the surface states of the Bi2Se3 couple with the superconductor strongly. And the zero-bias peak is from the bulk states of the conduction band with the chemical potential close to the band bottom.

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Authors

  • James Jun He

    • The Hong Kong University of Science and Technology

  • Hui Li

    • The Hong Kong University of Science and Technology

  • Tong Zhou

    • The Hong Kong University of Science and Technology

  • Huanwen Wang

    • The Hong Kong University of Science and Technology

  • Huachen Zhang

    • The Hong Kong University of Science and Technology

  • Hong-Chao Liu

    • The Hong Kong University of Science and Technology

  • Ya Yi

    • The Hong Kong University of Science and Technology

  • Changming Wu

    • The Hong Kong University of Science and Technology

  • Kam Tuen Law

    • The Hong Kong University of Science and Technology

  • Hongtao He

    • South University of Science and Technology of China

  • Jiangnong Wang

    • The Hong Kong University of Science and Technology