Triplet superconductivity by the orbital Rashba effect at surfaces of elemental superconductors
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arXiv
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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866915277082460160 |
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| author | Saunderson, Tom G. Gradhand, Martin Go, Dongwook Annett, James F. Mercaldo, Maria Teresa Cuoco, Mario Kläui, Mathias Gayles, Jacob Mokrousov, Yuriy |
| author_facet | Saunderson, Tom G. Gradhand, Martin Go, Dongwook Annett, James F. Mercaldo, Maria Teresa Cuoco, Mario Kläui, Mathias Gayles, Jacob Mokrousov, Yuriy |
| contents | It is often assumed that in a superconductor without spin-triplet pairing, the formation of unconventional spin-triplet densities requires the spin-orbit interaction in combination with either broken inversion symmetry or broken time-reversal symmetry. Here, we show from first principles the existence of supercurrent-driven spin triplet densities on the surface of a variety of simple superconducting materials without spin-orbit coupling. We are able to attribute this phenomenon to the superconducting non-relativistic orbital Rashba Edelstein effect. Furthermore, we find that the spin-orbit induced spin moment is one order of magnitude smaller than the orbital moment, and has a vanishing effect on the total magnitude of the induced triplet density. Our findings imply the existence of a route to generate spin-currents without the use of heavy metals. Additionally, as an orbital moment can couple directly to a magnetic field, it shows that orbital physics is the dominant term that drives the superconducting diode effect. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_01271 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Triplet superconductivity by the orbital Rashba effect at surfaces of elemental superconductors Saunderson, Tom G. Gradhand, Martin Go, Dongwook Annett, James F. Mercaldo, Maria Teresa Cuoco, Mario Kläui, Mathias Gayles, Jacob Mokrousov, Yuriy Superconductivity Mesoscale and Nanoscale Physics It is often assumed that in a superconductor without spin-triplet pairing, the formation of unconventional spin-triplet densities requires the spin-orbit interaction in combination with either broken inversion symmetry or broken time-reversal symmetry. Here, we show from first principles the existence of supercurrent-driven spin triplet densities on the surface of a variety of simple superconducting materials without spin-orbit coupling. We are able to attribute this phenomenon to the superconducting non-relativistic orbital Rashba Edelstein effect. Furthermore, we find that the spin-orbit induced spin moment is one order of magnitude smaller than the orbital moment, and has a vanishing effect on the total magnitude of the induced triplet density. Our findings imply the existence of a route to generate spin-currents without the use of heavy metals. Additionally, as an orbital moment can couple directly to a magnetic field, it shows that orbital physics is the dominant term that drives the superconducting diode effect. |
| title | Triplet superconductivity by the orbital Rashba effect at surfaces of elemental superconductors |
| topic | Superconductivity Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2504.01271 |