Interaction Enhanced Chirality Induced Spin Selectivity

Electron transport through chiral media shows a strong correlation between structural chirality and spin polarization, known as chirality induced spin selectivity (CISS). Despite the weak intrinsic spin-orbit coupling (SOC) of chiral systems composed of light elements, experiments report unexpectedly high spin polarization. To address this, we develop a theoretical framework that incorporates nearest-neighbor electron interactions within a self-consistent mean-field approach. We show that these interactions give rise to an emergent spin-polarized transport channel, enhancing spin selectivity even with weak SOC. This study highlights how electron-electron correlations can bridge structural chirality and spin-dependent transport, providing a microscopic mechanism for the enhanced spin polarization observed in CISS.