Heating at the Interface of a Superconductor in the Quantum Hall Regime

ORAL

Abstract

At the interface between a superconductor and a quantum Hall (QH) region, the QH edge states are proximitized to form the chiral Andreev edge states (CAES). Previous work has shown that electron to hole Andreev conversion enabled by the CAES result in non-local negative resistance, which persists deep in the quantum Hall regime. The exact microscopic origins of the CAES are still not well understood. Here I present transport measurements in a device expected to be sensitive to Andreev conversion which exhibits signatures of heat propagation via the chiral edge states. The interpretation of such experiments may be of importance in hybrid structures combining superconductors and topological states.

* Funding acknowledgement: Transport measurements by J.M., C.-C.C., J.C., and G.F. were supported by Division of Materials Sciences and Engineering, Office of Basic Energy Sciences, U.S. Department of Energy, under Award No. DE-SC0002765. Sample fabrication and characterization by J.M. was supported by the NSF Award DMR-2004870. F.A. was supported by a URC grant at Appalachian State University. K.W. and T.T. acknowledge support from JSPS KAKENHI (Grant Numbers 19H05790, 20H00354 and 21H05233). The sample fabrication was performed in part at the Duke University Shared Materials Instrumentation Facility (SMIF), a member of the North Carolina Research Triangle Nanotechnology Network (RTNN), which is supported by the National Science Foundation (Grant ECCS-1542015) as part of the National Nanotechnology Coordinated Infrastructure (NNCI).

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Presenters

  • Jordan McCourt

    Duke University

Authors

  • Jordan McCourt

    Duke University

  • Chun-Chia Chen

    Duke University

  • John Chiles

    Duke University

  • Kenji Watanabe

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

  • Takashi Taniguchi

    Kyoto Univ, National Institute for Materials Science, Research Center for Materials Nanoarchitectonics, Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, National Institute for Materials Sciences, NIMS, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, National Institute for Material Science, International Center for Materials Nanoarchitectonics, NIMS, Japan, International Center for Materials Nanoarchitectonics, Tsukuba, National Institue for Materials Science, Kyoto University, National Institute of Materials Science, International Center for Materials Nanoarchitectonics and National Institute for Materials Science

  • Francois Amet

    Appalachian State University

  • Gleb Finkelstein

    Duke University