Universal Josephson diode effect
| Autor: | Margarita Davydova, Saranesh Prembabu, Liang Fu |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
Superconductivity (cond-mat.supr-con)
Condensed Matter - Strongly Correlated Electrons Multidisciplinary Condensed Matter - Mesoscale and Nanoscale Physics Strongly Correlated Electrons (cond-mat.str-el) Condensed Matter - Superconductivity Condensed Matter::Superconductivity Mesoscale and Nanoscale Physics (cond-mat.mes-hall) FOS: Physical sciences |
| Zdroj: | Science Advances. 8 |
| ISSN: | 2375-2548 |
| DOI: | 10.1126/sciadv.abo0309 |
| Popis: | 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 $I_{c+}/I_{c-} \approx$ 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. Finally, 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. Comment: 14 pages, 10 figures total; update includes the effect of the disorder and minor corrections |
| Databáze: | OpenAIRE |
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