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| Main Authors: | , , |
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| Format: | Preprint |
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2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2401.04497 |
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| _version_ | 1866916209262329856 |
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| author | Yao, Dapeng Matsuo, Mamoru Yokoyama, Takehito |
| author_facet | Yao, Dapeng Matsuo, Mamoru Yokoyama, Takehito |
| contents | The recent experiment [R. Nakajima, et al., Nature 613, 479 (2023)] has reported a pair of oppositely polarized spins under an alternating electric current in a superconductor with a chiral structure. However, these behaviors cannot be explained by the conventional Edelstein effect and require a new mechanism. In this Letter, we propose a mechanism of spin current generation under an external electric field due to chiral phonons in a chiral-structure superconductor based on the Bogoliubov de Gennes and the Boltzmann equations. In our mechanism, chiral phonons are induced by electric field due to inversion symmetry breaking and electron-phonon interaction. They work as an effective Zeeman field and hence spin-polarize Bogoliubov quasiparticles in the superconductor. As a result, the spin current carried by quasiparticles flows along the screw axis and shows a quadratic dependence on the electric field at the low-field range, leading to a nonreciprocal spin transport. The spin current also shows a nonmonotonic temperature dependence and has a maximum at around the superconducting transition temperature. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_04497 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Electric field-induced nonreciprocal spin current due to chiral phonons in chiral-structure superconductors Yao, Dapeng Matsuo, Mamoru Yokoyama, Takehito Mesoscale and Nanoscale Physics The recent experiment [R. Nakajima, et al., Nature 613, 479 (2023)] has reported a pair of oppositely polarized spins under an alternating electric current in a superconductor with a chiral structure. However, these behaviors cannot be explained by the conventional Edelstein effect and require a new mechanism. In this Letter, we propose a mechanism of spin current generation under an external electric field due to chiral phonons in a chiral-structure superconductor based on the Bogoliubov de Gennes and the Boltzmann equations. In our mechanism, chiral phonons are induced by electric field due to inversion symmetry breaking and electron-phonon interaction. They work as an effective Zeeman field and hence spin-polarize Bogoliubov quasiparticles in the superconductor. As a result, the spin current carried by quasiparticles flows along the screw axis and shows a quadratic dependence on the electric field at the low-field range, leading to a nonreciprocal spin transport. The spin current also shows a nonmonotonic temperature dependence and has a maximum at around the superconducting transition temperature. |
| title | Electric field-induced nonreciprocal spin current due to chiral phonons in chiral-structure superconductors |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2401.04497 |