Anomalously large second Josephson harmonic in quantum well-based junctions

ORAL

Abstract

The current-phase relation (CPR) of a Josephson junction (JJ) contains information about the microscopic mechanisms behind supercurrent. The sinusoidal CPR can successfully describe most JJs made with different materials and synthesis technologies. However, CPR can also deviate from simply sinusoidal form, in particular it can feature higher order sinusoidal terms. We investigate InAs quantum well JJs with epitaxial Al contacts. The distance between Al electrodes is of order 100 nm shorter than the mean free path in the quantum well. We perform diffraction pattern measurements, SQUID measurements and Shapiro step measurements all pointing at a strong intrinsic second order harmonic.

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Presenters

  • Azarin Zarassi

    • Physics, Univ. of Pittsburgh
    • Univ of Pittsburgh

Authors

  • Azarin Zarassi

    • Physics, Univ. of Pittsburgh
    • Univ of Pittsburgh

  • Lucas Jarjat

    • Ecole Normale Superieure

  • Vince van de Sande

    • TU Eindhoven

  • Mihir Pendharkar

    • Dept. of Electrical Engineering, Univ. of California, Santa Barbara, CA, USA
    • IEE, UC Santa Barbara
    • University of California Santa Barbara
    • Univ of California, Santa Barbara
    • Electrical and Computer Engineering, University of California Santa Barbara
    • Electrical & Computer Engineering, University of California, Santa Barbara
    • University of California, Santa Barbara

  • Joon Sue Lee

    • California Nano-Systems Institute, Univ. of California, Santa Barbara, CA, USA
    • University of Tennessee Knoxville
    • Univ of California, Santa Barbara
    • Physics & Astronomy, Seoul National University
    • University of California Santa Barbara
    • California Nanosystems Institute, University of California Santa Barbara
    • University of California, Santa Barbara

  • Anthony P McFadden

    • UCSB
    • Dept. of Electrical Engineering, Univ. of California, Santa Barbara, CA, USA
    • University of California, Santa Barbara
    • Univ of California, Santa Barbara

  • Sean Harrington

    • Materials Department, University of California, Santa Barbara
    • Dept. of Materials Engineering, Univ. of California, Santa Barbara, CA, USA
    • IEE, UC Santa Barbara
    • Univ of California, Santa Barbara
    • University of California, Santa Barbara

  • Sasa Gazibegovic

    • Dept. of Physics, Technical University, Eindhoven, The Netherlands
    • Eindhoven University of Technology
    • Department of Applied Physics, Eindhoven University of Technology
    • Applied Physics, Eindhoven Univ. of Technology
    • TU Eindhoven

  • Ghada Badawy

    • Dept. of Physics, Technical University, Eindhoven, The Netherlands
    • Eindhoven University of Technology
    • Department of Applied Physics, Eindhoven University of Technology
    • Applied Physics, Eindhoven Univ. of Technology
    • TU Eindhoven

  • Roy Op het Veld

    • Dept. of Physics, Technical University, Eindhoven, The Netherlands
    • Eindhoven University of Technology
    • Applied Physics, Eindhoven Univ. of Technology
    • TU Eindhoven
    • Department of Applied Physics, Eindhoven University of Technology

  • Moira Hocevar

    • Institute Neel, CNRS, Grenoble, France
    • Institute Neel, CEA Grenoble
    • Neel Institute, CNRS

  • Susheng Tan

    • Univ of Pittsburgh

  • Erik Bakkers

    • Dept. of Physics, Technical University, Eindhoven, The Netherlands
    • Eindhoven University of Technology
    • Department of Applied Physics, Eindhoven University of Technology
    • Applied Physics, Eindhoven Univ. of Technology
    • TU Eindhoven
    • Applied Physics, Eindhoven University of Technology

  • Chris J Palmstrom

    • Materials Department, University of California, Santa Barbara
    • UCSB
    • Departments of Electrical and Computer Engineering and Materials, University of California, Santa Barbara
    • Dept. of Electrical Engineering, Univ. of California, Santa Barbara, CA, USA
    • Univ. of California, Santa Barbara
    • Electrical and Computer Engineering Department, University of California, Santa Barbara
    • University of California, Santa Barbara
    • IEE, UC Santa Barbara
    • University of California Santa Barbara
    • Univ of California, Santa Barbara
    • Electrical and Computer Engineering, University of California Santa Barbara
    • Materials and Electrical & Comp. Eng, University of California, Santa Barbara

  • Sergey M Frolov

    • Dept. of Physics, Univ. of Pittsburgh, Pittsburgh, PA, USA
    • Univ of Pittsburgh
    • University of Pittsburgh
    • Physics, Univ. of Pittsburgh