Spin Polarization in Chiral Molecules within a One-Particle System with Spin–Orbit Coupling and Light-Induced Perturbations

Sammanfattning

Chirality-induced spin selectivity is a quantum phenomenon where chiral molecular structures exhibit spin-dependent electron transmission, resulting in spontaneous magnetization or polarization. In this study, we investigate Chirality-induced spin selectivity using a single-particle tight-binding model that incorporates spin–orbit coupling and time-dependent perturbations via Peierls substitution, simulating the effect of circularly and linearly polarized green light. The time evolution of the system is computed in the interaction picture, with numerical simulations carried out in Python. Spin polarization probabilities were extracted from the evolved wave functions and visualized as functions of time and electron sites.In this study, we find that polarized light generated light pulses, but the spin polarization remained unchanged. Unlike previous studies, which included a metal substrate and observed spin polarization changes, our setup did not contain any substrate. This absence may explain the unchanged spin state, possibly due to a reduced interaction with the environment or neighboring molecules.