Further studies of quantum Hall edge states proximitized by a superconducting nanostructure

ORAL

Abstract

Recent interest in condensed matter physics has focused on research in topological superconductors and fault-tolerant quantum computing. One of the areas of interest is the integration of the quantum Hall (QH) edge states with superconductors (SC), resulting in the formation of chiral Andreev edge states (CAES). CAES arise from Andreev reflection along the QH/SC interface, hybridizing electron-like and hole-like edge states. Despite progress, the precise mechanism of Andreev conversion at the QH/SC interface remains under investigation. The interference between transmitted and reflected CAES caused by the interaction between QH edge states and quantized states around superconducting nanostructures could reveal intriguing physics. The resulting signals offer new insights into the nature of the CAES. Our work provides a deeper understanding of chiral edge states in proximity-induced superconductivity.

*Sample fabrication and transport measurements by C.C., J.M., J.C., and G.F., were supported by the Division of Materials Sciences and Engineering, Office of Basic Energy Sciences, U.S. Department of Energy, under Award No. DE-SC0002765. K.W. and T.T. acknowledge support from JSPS KAKENHI (Grant Numbers 19H05790, 20H00354, and 21H05233).

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Presenters

  • Chun-Chia Chen

    • Duke University

Authors

  • Chun-Chia Chen

    • Duke University

  • Jordan McCourt

    • Duke University

  • John Chiles

    • Duke University

  • Kenji Watanabe

    • National Institute for Materials Science
    • NIMS
    • Research Center for Functional Materials, National Institute for Materials Science
    • Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • Research Center for Functional Materials, National Institute of Material Science, Tsukuba, Japan
    • National Institute of Materials Science
    • Advanced Materials Laboratory, National Institute for Materials Science

  • Takashi Taniguchi

    • National Institute for Materials Science
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • International Center for Materials Nanoarchitectonics, National Institute of Material Science, Tsukuba, Japan
    • Advanced Materials Laboratory, National Institute for Materials Science

  • Gleb Finkelstein

    • Duke University