Spin properties of the chiral Andreev edge states

ORAL

Abstract

At the interfaces between a superconductor and a quantum Hall, the edge states are proximitized forming chiral Andreev edge states (CAES). The presence of CAES can be detected via non-local resistance measurements, where downstream of the superconducting contact either positive or negative can be measured, indicating primarily normal or Andreev reflections. In this abstract, we investigate the spin properties of the CAES. We use a local top gate to spatially separate the edge states to/from the superconductor into different spin-polarized channels, which allows us to explore the spin properties of the CAES signals. This study contributes to the understanding of spin-dependent Andreev reflections in the quantum Hall regime and sheds light on the interplay of CAES across different edge-state channels.

* Transport measurements by C.C., J.M., Z.I., J.C., and G.F., were by the 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 C.C. and L.Z. were 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).

–

Presenters

  • Chun-Chia Chen

    Duke University

Authors

  • Chun-Chia Chen

    Duke University

  • Jordan McCourt

    Duke University

  • John Chiles

    Duke University

  • Zubair Iftikhar

    Duke University

  • Lingfei Zhao

    Department of Physics and Duke Quantum Center, Duke University, Durham, NC, 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