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.
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.
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Presenters
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Tarun Tummuru
University of British Columbia
Authors
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Pavel Volkov
Harvard University; University of Connecticut, Rutgers University, Harvard University; University of Connecticut; Rutgers University
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Tarun Tummuru
University of British Columbia
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Marcel Franz
University of British Columbia
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Jed Pixley
Rutgers University
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Stephan Plugge
University of British Columbia
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Etienne Lantagne-Hurtubise
California Institute of Technology, Caltech