We study the non-equilibrium dynamics of electron transmission from a straight waveguide to a helix with spin-orbit coupling. Transmission is found to be spin-selective and can lead to large spin polarizations of the itinerant electrons. The degree of spin selectivity depends on the width of the interface region, and no polarization is found for single-point couplings. We show that this is due to momentum conservation conditions arising from extended interfaces. We therefore identify interface structure and conservation of momentum as crucial ingredients for chiral-induced spin selectivity, and confirm that this mechanism is robust against static disorder.
@article{arxiv.2111.14770,
title = {Interface-Induced Conservation of Momentum Leads to Chiral-Induced Spin Selectivity},
author = {Clemens Vittmann and R. Kevin Kessing and James Lim and Susana F. Huelga and Martin B. Plenio},
journal= {arXiv preprint arXiv:2111.14770},
year = {2022}
}