Josephson diode effect in twisted d-wave superconductors

ORAL

Abstract

Twisted d-wave superconductors near 45° twist are predicted to spontaneously break time-reversal symmetry due to cotunneling of Cooper pairs. We study emergent critical current non-reciprocity near 45° twist, which serves as a direct probe of time-reversal breaking.

For a spontaneously broken time-reversal symmetry, critical current is shown to have different values depending on the direction of the current (diode effect). The direction of the diode effect can be reversed by sweeping the applied current. The dependence of the effect magnitude on the twist angle and interface resistance is evaluated. We also discuss the possible effects of explicit time-reversal symmetry, not related to cotunneling of Cooper pairs, on the diode effect.

–

Presenters

  • Tarun Tummuru

    • University of British Columbia

Authors

  • Pavel Volkov

    • Harvard University; University of Connecticut
    • Rutgers University
    • Harvard University; University of Connecticut; Rutgers University

  • Tarun Tummuru

    • University of British Columbia

  • Marcel Franz

    • University of British Columbia

  • Jed Pixley

    • Rutgers University

  • Stephan Plugge

    • University of British Columbia

  • Etienne Lantagne-Hurtubise

    • California Institute of Technology
    • Caltech