New Excitation at the Interface between High-Temperature Superconductors and Topological Insulators

ORAL

Abstract

There has been an increased interest in the interplay between d-wave superconducting order parameter and helical surface states of a topological insulator, due to the recent theoretical proposals predicting the emergence of novel excitations at these interfaces. Motivated by these intriguing proposals, we fabricated high-temperature superconductor/topological insulator junctions by the mechanical bonding method [1]. We report the observation of a zero-bias conductance peak (ZBCP) at temperatures below the critical temperature of the bulk superconductor. The ZBCP in our data indicates the emergence of a new excitation in our devices. I will present a detailed study of the differential conductance measurement of our samples at various temperatures and magnetic fields.\\[4pt] [1] P. Zareapour, et al., Nature Communications 3, 1056 (2012).

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Authors

  • Parisa Zareapour

    Department of Physics and Institute for Optical Sciences, University of Toronto

  • Alex Hayat

    Department of Physics and Institute for Optical Sciences, University of Toronto

  • Shu Yang Frank Zhao

    Department of Physics and Institute for Optical Sciences, University of Toronto

  • Michael Kreshchuk

    Department of Physics and Institute for Optical Sciences, University of Toronto

  • Yong Kiat Lee

    Department of Physics and Institute for Optical Sciences, University of Toronto

  • Anjan Reijnders

    University of Toronto, Department of Physics and Institute for Optical Sciences, University of Toronto

  • Achint Jain

    Department of Physics and Institute for Optical Sciences, University of Toronto

  • Zhijun Xu

    Brookhaven National Laboratory

  • Alina Yang

    Brookhaven National Laboratory

  • Genda Gu

    Brookhaven National Laboratory, Condensed Matter Physics and Materials Science Department, Brookhaven National laboratory, Brookhaven Natl Lab, Brookhaven National Lab, Brookhaven National Labs

  • Shuang Jia

    Department of Chemistry, Princeton University

  • Robert Cava

    Department of Chemistry, Princeton University, Department of Chemistry, Princeton university, Princeton NJ 08544 USA, Princeton University Chemistry Department, Institute for Quantum Matter, Princeton University, Department of Chemistry, Princeton University, NJ, 08544, USA, Princeton University

  • Kenneth Burch

    Department of Physics and Institute for Optical Sciences, University of Toronto