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arXiv · 2508.03886

Chirality-Induced Spin Selectivity: Nonlinear Spin Response from Electron-Phonon Scattering

Mayank Gupta·Andrew Grieder·Mayada Fadel·Jacopo Simoni·Junting Yu·Ravishankar Sundararaman·Yuan Ping
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Abstract

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.

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Mayank Gupta, Andrew Grieder, Mayada Fadel, Jacopo Simoni, Junting Yu, Ravishankar Sundararaman, Yuan Ping. 2025-08-05. Chirality-Induced Spin Selectivity: Nonlinear Spin Response from Electron-Phonon Scattering. https://arxiv.org/abs/2508.03886

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