Chirality-Induced Spin Selectivity: Nonlinear Spin Response from Electron-Phonon Scattering
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arXiv
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| Autores principales: | , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866910213455478784 |
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| author | Gupta, Mayank Grieder, Andrew Fadel, Mayada Simoni, Jacopo Yu, Junting Sundararaman, Ravishankar Ping, Yuan |
| author_facet | Gupta, Mayank Grieder, Andrew Fadel, Mayada Simoni, Jacopo Yu, Junting Sundararaman, Ravishankar Ping, Yuan |
| contents | Chirality-induced spin selectivity (CISS) generates spin-polarized currents in nonmagnetic materials from structural chirality alone, yet its microscopic origin remains debated. Using a first-principles spatiotemporal density-matrix dynamics approach including electron-phonon scatterings with self-consistent spin-orbit coupling (SOC), we elucidate the interplay of SOC, structural chirality, and spin-dependent electron-phonon interactions in driving the generation and transport of spin and orbital angular momentum. In particular we quantitatively distinguish CISS from the collinear Edelstein effect (CEE) in trigonal selenium, a prototypical chiral solid. CEE yields a spatially uniform spin polarization scaling linearly with applied field ($S_z \propto E$). In contrast, explicit spin-dependent electron-phonon scattering produces a nonlinear response ($S_z \propto E^2$) and a length-dependent spin accumulation -- the hallmark experimental signature of CISS. We identify intervalley scattering mediated by chiral phonon angular momentum as the microscopic origin of this nonlinearity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_03886 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Chirality-Induced Spin Selectivity: Nonlinear Spin Response from Electron-Phonon Scattering Gupta, Mayank Grieder, Andrew Fadel, Mayada Simoni, Jacopo Yu, Junting Sundararaman, Ravishankar Ping, Yuan Materials Science Chirality-induced spin selectivity (CISS) generates spin-polarized currents in nonmagnetic materials from structural chirality alone, yet its microscopic origin remains debated. Using a first-principles spatiotemporal density-matrix dynamics approach including electron-phonon scatterings with self-consistent spin-orbit coupling (SOC), we elucidate the interplay of SOC, structural chirality, and spin-dependent electron-phonon interactions in driving the generation and transport of spin and orbital angular momentum. In particular we quantitatively distinguish CISS from the collinear Edelstein effect (CEE) in trigonal selenium, a prototypical chiral solid. CEE yields a spatially uniform spin polarization scaling linearly with applied field ($S_z \propto E$). In contrast, explicit spin-dependent electron-phonon scattering produces a nonlinear response ($S_z \propto E^2$) and a length-dependent spin accumulation -- the hallmark experimental signature of CISS. We identify intervalley scattering mediated by chiral phonon angular momentum as the microscopic origin of this nonlinearity. |
| title | Chirality-Induced Spin Selectivity: Nonlinear Spin Response from Electron-Phonon Scattering |
| topic | Materials Science |
| url | https://arxiv.org/abs/2508.03886 |