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arXiv · 2602.21718

Antiparallel spin polarizations as quadratic response in chiral systems

Akane Inda·Kohei Hattori·Hiroaki Kusunose·Satoru Hayami
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Abstract

Chirality-dependent spin generation has attracted considerable attention in condensed matter physics. In this paper, we theoretically investigate antiparallel spin polarization as a chirality-dependent quadratic response, by using a finite chiral system composed of triangular prisms. Based on the nonlinear Kubo formalism and real-time simulations, we demonstrate that spatially inhomogeneous antiparallel spin polarizations are induced as a dissipative quadratic DC response to a homogeneous AC electric field. In particular, we elucidate role of microscopic parameters characterizing the handedness of chirality, and naive expectation of spin polarization as a consequence of spin accumulation of spin current.

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Akane Inda, Kohei Hattori, Hiroaki Kusunose, Satoru Hayami. 2026-02-25. Antiparallel spin polarizations as quadratic response in chiral systems. https://arxiv.org/abs/2602.21718

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