Spin swapping mediated by spin-orbital textures in centrosymmetric multiorbital materials
Abstract
Spin swapping converts a primary spin current into a secondary one by interchanging its flow and spin-polarization directions, attributed to spin-orbit scattering or spin-band splitting. Here we uncover a fundamentally distinct route to spin swapping arising from the orbital degree of freedom in the spin pumping to centrosymmetric multiorbital materials \textit{without spin-band splitting}. When the dynamical proximity ferromagnet injects a longitudinal spin current flowing normal to the interface, spin-orbit-entangled orbital textures redirect the injected spins into longitudinal and transverse orbital currents. Their subsequent conversion back to the spin sector generates transverse spin currents with propagation and polarization directions swapped relative to the primary spin current. The swapping efficiency achieves 50% for Ge and Si. Governed by a fourth-rank tensor constrained by crystalline symmetry and without requiring spin-orbit scattering or inversion symmetry breaking, our finding reveals spin-orbital textures as hidden intermediate channels of spin swapping with unexplored material choices and functionalities.
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BibTeX
@misc{cai2026spin,
title = {{Spin swapping mediated by spin-orbital textures in centrosymmetric multiorbital materials}},
author = {Chengyuan Cai and Hanchen Wang and Rui-Chun Xiao and Tao Yu},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.06163},
eprint = {2611.06163},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.06163},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Spin swapping mediated by spin-orbital textures in centrosymmetric multiorbital materials
AU - Chengyuan Cai
AU - Hanchen Wang
AU - Rui-Chun Xiao
AU - Tao Yu
PY - 2026
DA - 2026/11/04
PB - arXiv
DO - 10.48550/arxiv.2611.06163
UR - https://arxiv.org/abs/2611.06163
AB - Spin swapping converts a primary spin current into a secondary one by interchanging its flow and spin-polarization directions, attributed to spin-orbit scattering or spin-band splitting. Here we uncover a fundamentally distinct route to spin swapping arising from the orbital degree of freedom in the spin pumping to centrosymmetric multiorbital materials \textit{without spin-band splitting}. When the dynamical proximity ferromagnet injects a longitudinal spin current flowing normal to the interface, spin-orbit-entangled orbital textures redirect the injected spins into longitudinal and transverse orbital currents. Their subsequent conversion back to the spin sector generates transverse spin currents with propagation and polarization directions swapped relative to the primary spin current. The swapping efficiency achieves 50% for Ge and Si. Governed by a fourth-rank tensor constrained by crystalline symmetry and without requiring spin-orbit scattering or inversion symmetry breaking, our finding reveals spin-orbital textures as hidden intermediate channels of spin swapping with unexplored material choices and functionalities.
ER -