Replicas of Andreev spectra in InSb nanowires

ORAL

Abstract

A superconducting contact to a quantum dot can induce electron-hole correlations known as Andreev bound states (ABSs) inside the dot. We study transport through ABSs in InSb nanowires with superconducting contacts as both source and drain. Anomalous transport resonances are observed in these systems, namely one or more (up to 4) replicas of Andreev spectra at higher source-drain biases, as well as negative differential conductance shadows of the resonances inside the induced gap. We develop a model that captures these features by considering the effect of a soft-gap superconducting probe, and of additional ABSs induced in the dot, and in the nanowire segments adjacent to the dot. Our findings extend the framework for the interpretation of tunneling experiments in mesoscopic systems, and specifically of Majorana bound states which are studied with semiconductor nanowire probes similar to those used here.

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Presenters

  • Azarin Zarassi

    University of Pittsburgh

Authors

  • Azarin Zarassi

    University of Pittsburgh

  • Zhaoen Su

    University of Pittsburgh

  • Jen-Feng Hsu

    Univ of Pittsburgh, University of Pittsburgh, Physics, University of Pittsburgh

  • Pablo San-Jose

    Materials Science Factory, ICMM, CSIC, Materials Science Factory, ICMM, CSIC - Madrid, Materials Science Factory, Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC

  • Elsa Prada

    IFIMAC and Universidad Autonoma de Madrid, UAM, Universidad Autonoma de Madrid

  • Ramon Aguado

    Materials Science Factory, ICMM, CSIC, Materials Science Factory, ICMM, CSIC - Madrid, Materials Science Factory, Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC

  • Eduardo Jian Hua Lee

    Universidad Autonoma de Madrid

  • Diana Car

    Eindhoven Univ of Tech, Department of Applied Physics, Eindhoven University of Technology, Eindhoven University of Technology

  • Sasa Gazibegovic

    Department of Applied Physics, Eindhoven University of Technology, Eindhoven Univ of Tech, Eindhoven University of Technology

  • Roy Op het Veld

    Eindhoven Univ of Tech, Department of Applied Physics, Eindhoven University of Technology, Eindhoven University of Technology

  • Sébastien Plissard

    LAAS, CNRS, Université de Toulouse, LAAS CNRS

  • John Logan

    University of California Santa Barbara, Materials Department, University of California, University of California-Santa Barbara, University of California - Santa Barbara

  • Mihir Pendharkar

    University of California Santa Barbara, Department of Electrical and Computer Engineering, University of California, Santa Barbara, University of California - Santa Barbara, Univ of California - Santa Barbara

  • Dan Pennachio

    University of California - Santa Barbara

  • Joon Sue Lee

    University of California Santa Barbara, California NanoSystems Institute, University of California, Santa Barbara, University of California - Santa Barbara, Materials Science, University of California - Santa Barbara, Univ of California - Santa Barbara

  • Moira Hocevar

    Institut Néel CNRS

  • Chris Palmstrom

    University of California Santa Barbara, Materials Department, California NanoSystems Institute, Electrical and Computer Engineering, University of California, University of California-Santa Barbara, California Nanosystems Institute, Dept. of Electrical and Computer Engineering, and Dept. of Materials, Univ of California - Santa Barbara, University of California - Santa Barbara, Electronics & Computer Enginneering, University of California Santa Barbara, Materials Department, University of California, Santa Barbara, Materials, University of California Santa Barbara, Univ of California - Santa Barbara

  • Erik P. A. M. Bakkers

    Department of Applied Physics, Eindhoven University of Technology, Eindhoven University of Technology

  • Sergey Frolov

    University of Pittsburgh