Spin supercurrent in parity mixed superconductors with structural chirality
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arXiv
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| Autori principali: | , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866916649462923264 |
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| author | Hara, Keito Yanase, Youichi |
| author_facet | Hara, Keito Yanase, Youichi |
| contents | Chiral materials exhibit a spin filtering effect, so-called chirality-induced spin selectivity (CISS). A recent observation of spin accumulation at the ends of a chiral-structured superconductor has opened up a new pathway for studying the CISS effect in superconductors. In chiral-structured superconductors, the admixture of the spin-singlet and spin-triplet order parameters significantly influences the properties of superconductivity. In this paper, we investigate the interplay between the superconducting order parameter and supercurrent-induced spin current, namely, the superconducting CISS effect. In weakly party-mixed superconductors, the spin current, which is predominantly temperature-independent, is carried by spin-polarized Cooper pairs with finite center-of-mass momentum. In contrast, in strongly party-mixed superconductors the temperature-dependent spin current is also carried by electrons with opposite momentum and antiparallel spins forming a Cooper pair. Chiral-structured superconductors will offer a novel platform for exploring the CISS effect and may provide deeper insights into its underlying mechanisms related to the parity-mixed order parameter. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_07948 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Spin supercurrent in parity mixed superconductors with structural chirality Hara, Keito Yanase, Youichi Superconductivity Chiral materials exhibit a spin filtering effect, so-called chirality-induced spin selectivity (CISS). A recent observation of spin accumulation at the ends of a chiral-structured superconductor has opened up a new pathway for studying the CISS effect in superconductors. In chiral-structured superconductors, the admixture of the spin-singlet and spin-triplet order parameters significantly influences the properties of superconductivity. In this paper, we investigate the interplay between the superconducting order parameter and supercurrent-induced spin current, namely, the superconducting CISS effect. In weakly party-mixed superconductors, the spin current, which is predominantly temperature-independent, is carried by spin-polarized Cooper pairs with finite center-of-mass momentum. In contrast, in strongly party-mixed superconductors the temperature-dependent spin current is also carried by electrons with opposite momentum and antiparallel spins forming a Cooper pair. Chiral-structured superconductors will offer a novel platform for exploring the CISS effect and may provide deeper insights into its underlying mechanisms related to the parity-mixed order parameter. |
| title | Spin supercurrent in parity mixed superconductors with structural chirality |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2503.07948 |