Theory of spin Seebeck effect activated by acoustic chiral phonons
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866912543048466432 |
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| author | Nishimura, Naoki Funato, Takumi Matsuo, Mamoru Kato, Takeo |
| author_facet | Nishimura, Naoki Funato, Takumi Matsuo, Mamoru Kato, Takeo |
| contents | We theoretically explore the generation of spin current driven by a temperature gradient in a junction between a chiral insulator and a normal metal. Based on the gyromagnetic response induced by microscopic acoustic-phonon-mediated lattice rotation, we derive a formula for the spin current when a finite temperature difference is imposed between two ends of the sample. We clarify how the phonon-mediated spin current depends on the sample geometry, the thermal conductivity, the heat conductance at the interface, and the average temperature. Our formulation provides a microscopic foundation for the chiral-phonon-activated spin Seebeck effect without relying on magnetism or spin-orbit interactions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_23083 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Theory of spin Seebeck effect activated by acoustic chiral phonons Nishimura, Naoki Funato, Takumi Matsuo, Mamoru Kato, Takeo Mesoscale and Nanoscale Physics We theoretically explore the generation of spin current driven by a temperature gradient in a junction between a chiral insulator and a normal metal. Based on the gyromagnetic response induced by microscopic acoustic-phonon-mediated lattice rotation, we derive a formula for the spin current when a finite temperature difference is imposed between two ends of the sample. We clarify how the phonon-mediated spin current depends on the sample geometry, the thermal conductivity, the heat conductance at the interface, and the average temperature. Our formulation provides a microscopic foundation for the chiral-phonon-activated spin Seebeck effect without relying on magnetism or spin-orbit interactions. |
| title | Theory of spin Seebeck effect activated by acoustic chiral phonons |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2505.23083 |