Transport Studies in Gate-Tunable Multi-Terminal Josephson Junctions

ORAL

Abstract

Josephson junctions with three or more superconducting leads are predicted to exhibit topological physics in the presence of few conducting modes within the interstitial normal material.[1][2] Such topological behavior manifests itself as signatures in the complex transport properties between the different terminals, with topological phase transitions occurring as a function of phase and voltage bias.[3] Here we study the superconducting and resistive properties of top-gated multi-terminal Josephson devices, based on an InAs 2DEG proximitized with epitaxial aluminum. The top gate is used to deplete the 2DEG, and resistances are analyzed under various bias currents and magnetic fields.

1. Riwar et al. Nature Communications 7, 11167 (2016)
2. Xie et al. Phys. Rev. B 96, 161406(R) (2017)
3. Meyer et al. Phys. Rev. Lett. 119, 136807 (2017)

*National Science Foundation

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Presenters

  • Gino Graziano

    • School of Physics and Astronomy, University of Minnesota

Authors

  • Gino Graziano

    • School of Physics and Astronomy, University of Minnesota

  • Joon Sue Lee

    • University of California - Santa Barbara
    • University of California Santa Barbara
    • Dept. of ECE, University of California Santa Barbara
    • California NanoSystems Institute, University of California, Santa Barbara
    • Department of Physics, The Pennsylvania State University
    • University of California, Santa Barbara

  • Mihir Pendharkar

    • University of California - Santa Barbara
    • University of California Santa Barbara
    • Dept. of ECE, University of California Santa Barbara
    • Department of Electrical and Computer Engineering, University of California, Santa Barbara
    • Electrical and Computer Engineering, University of California, Santa Barbara
    • University of California Santa Barbara, Materials Engineering
    • University of California, Santa Barbara

  • Chris Palmstrom

    • University of California, Santa Barbara
    • University of California - Santa Barbara
    • University of California Santa Barbara
    • Electrical & Computer Engineering, University of California, Santa Barbara
    • ECE and Materials, University of California, Santa Barbara
    • Dept. of ECE, University of California Santa Barbara
    • Materials Department, University of California, Santa Barbara
    • Materials Engineering, University of California, Santa Barbara
    • University of California Santa Barbara, Materials Engineering
    • Departments of Electrical and Computer Engineering and Materials, University of California, Santa Barbara

  • Vlad S Pribiag

    • School of Physics and Astronomy, University of Minnesota
    • University of Minnesota
    • School of Physics and Astronomy, University of Minnesota Twin Cities
    • Physics, University of Minnesota