Anomalous Josephson effect in superconducting multilayers

ORAL

Abstract

We investigate the Josephson current-phase relation in a planar diffuse tunnelling superconducting multilayer junction in the parallel magnetic field. We compute the supercurrent for a fixed jump of the phase of the order parameter at each of the two insulating interfaces.

This allows us to find the current-phase relation of the junction.

The perturbation theory in junction conductance allows us to determine the first and second harmonics of the current-phase relation at a given magnetic field.

Strong spin-orbit interaction in S'-region makes the Josephson effect anomalous.

Specifically, the combination of the spin-orbit and Zeeman interactions give rise to an effective vector potential.

This causes each harmonic of the current-phase relation to shift without changing the overall shape of the current-phase relation.

*We acknowledge financial support from the Israel Science Foundation, Grant No. 2665/20 (A. O. and M. K.). This work at UW-Madison was financially supported by the National Science Foundation, Quantum Leap Challenge Institute for Hybrid Quantum Architectures and Networks Grant No. OMA-2016136. A. L. gratefully acknowledges H. I. Romnes Faculty Fellowship provided by the University of Wisconsin-Madison Office of the Vice Chancellor for Research and Graduate Education with funding from the Wisconsin Alumni Research Foundation.

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Publication: Anomalous Josephson effect in superconducting multilayers (planned paper)

Presenters

  • Aleksandr S Osin

    • Hebrew University of Jerusalem

Authors

  • Aleksandr S Osin

    • Hebrew University of Jerusalem

  • Maxim Khodas

    • Hebrew University of Jerusalem

  • Alex Levchenko

    • University of Wisconsin-Madison