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Universal Josephson diode effect

Author(s)
Davydova, Margarita; Prembabu, Saranesh; Fu, Liang
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Abstract
<jats:p> We propose a universal mechanism for the Josephson diode effect in short Josephson junctions. The proposed mechanism is due to finite Cooper pair momentum and is a manifestation of simultaneous breaking of inversion and time-reversal symmetries. The diode efficiency is up to 40%, which corresponds to an asymmetry between the critical currents in opposite directions <jats:italic>I</jats:italic> <jats:sub>c+</jats:sub> / <jats:italic>I</jats:italic> <jats:sub>c−</jats:sub> ≈ 230%. We show that this arises from both the Doppler shift of the Andreev bound state energies and the phase-independent asymmetric current from the continuum. Last, we propose a simple scheme for achieving finite-momentum pairing, which does not rely on spin-orbit coupling and thus greatly expands existing platforms for the observation of supercurrent diode effects. </jats:p>
Date issued
2022
URI
https://hdl.handle.net/1721.1/146053
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Science Advances
Publisher
American Association for the Advancement of Science (AAAS)
Citation
Davydova, Margarita, Prembabu, Saranesh and Fu, Liang. 2022. "Universal Josephson diode effect." Science Advances, 8 (23).
Version: Final published version

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