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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