Current phase relation in a planar graphene Josephson junction with spin-orbit coupling
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866908336434184192 |
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| author | Bonasera, Federico Falci, Giuseppe A. Paladino, Elisabetta Pellegrino, Francesco M. D. |
| author_facet | Bonasera, Federico Falci, Giuseppe A. Paladino, Elisabetta Pellegrino, Francesco M. D. |
| contents | We study a graphene Josephson junction where the inner graphene layer is subjected to spin-orbit coupling by proximity effect. This could be achieved, for example, by growing the graphene layer on top of a transition metal dichalcogenide, such as WS$_2$. Here, we focus on the ballistic, wide, and short junction limits and study the effects of the spin-orbit interaction on the supercurrent. In particular, we analyze the current phase relation using an analytical approach based on the continuum model. We find combinations of types of spin-orbit coupling that significantly suppress the supercurrent by opening a gap in the graphene band structure. At the same time, other combinations enhance it, acting as an effective spin-valley resolved chemical potential. Moreover, we find that a strong Rashba spin-orbit coupling leads to a junction with a highly voltage tunable harmonic content. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_17517 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Current phase relation in a planar graphene Josephson junction with spin-orbit coupling Bonasera, Federico Falci, Giuseppe A. Paladino, Elisabetta Pellegrino, Francesco M. D. Mesoscale and Nanoscale Physics Materials Science Superconductivity Quantum Physics We study a graphene Josephson junction where the inner graphene layer is subjected to spin-orbit coupling by proximity effect. This could be achieved, for example, by growing the graphene layer on top of a transition metal dichalcogenide, such as WS$_2$. Here, we focus on the ballistic, wide, and short junction limits and study the effects of the spin-orbit interaction on the supercurrent. In particular, we analyze the current phase relation using an analytical approach based on the continuum model. We find combinations of types of spin-orbit coupling that significantly suppress the supercurrent by opening a gap in the graphene band structure. At the same time, other combinations enhance it, acting as an effective spin-valley resolved chemical potential. Moreover, we find that a strong Rashba spin-orbit coupling leads to a junction with a highly voltage tunable harmonic content. |
| title | Current phase relation in a planar graphene Josephson junction with spin-orbit coupling |
| topic | Mesoscale and Nanoscale Physics Materials Science Superconductivity Quantum Physics |
| url | https://arxiv.org/abs/2504.17517 |