Interband-Pairing-Boosted Supercurrent Diode Effect in Multiband Superconductors
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866918162702794752 |
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| author | Mei, Jiong Qin, Shengshan Hu, Jiangping |
| author_facet | Mei, Jiong Qin, Shengshan Hu, Jiangping |
| contents | We unveil a mechanism that enables a robust supercurrent diode effect in Josephson junctions based on multiband superconductors. We predict that interband pairing can significantly amplifies this effect, even under weak spin-orbit coupling while intraband pairing alone would render it negligible. To illustrate this, we examine monolayer FeSe/STO, a system where recent experiments suggest interband pairing in either a nodeless $d$-wave or $η$ pairing state. Using experimentally derived parameters, we predict that FeSe/STO can serve as a high-temperature platform for realizing a substantial supercurrent diode effect, with efficiencies reaching up to $30\%$ for $d$-wave pairing and $12\%$ for $η$ pairing. These results demonstrate that measuring the supercurrent diode effect can provides a powerful probe of the pairing symmetry in monolayer FeSe/STO, offering critical insights into its superconducting state. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_15788 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Interband-Pairing-Boosted Supercurrent Diode Effect in Multiband Superconductors Mei, Jiong Qin, Shengshan Hu, Jiangping Superconductivity Mesoscale and Nanoscale Physics We unveil a mechanism that enables a robust supercurrent diode effect in Josephson junctions based on multiband superconductors. We predict that interband pairing can significantly amplifies this effect, even under weak spin-orbit coupling while intraband pairing alone would render it negligible. To illustrate this, we examine monolayer FeSe/STO, a system where recent experiments suggest interband pairing in either a nodeless $d$-wave or $η$ pairing state. Using experimentally derived parameters, we predict that FeSe/STO can serve as a high-temperature platform for realizing a substantial supercurrent diode effect, with efficiencies reaching up to $30\%$ for $d$-wave pairing and $12\%$ for $η$ pairing. These results demonstrate that measuring the supercurrent diode effect can provides a powerful probe of the pairing symmetry in monolayer FeSe/STO, offering critical insights into its superconducting state. |
| title | Interband-Pairing-Boosted Supercurrent Diode Effect in Multiband Superconductors |
| topic | Superconductivity Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2510.15788 |