The Giant Spin Hall Effect at Optical Frequencies
Abstract
We generalize the spin Hall angle to laser pulses of finite frequencies in the linear response regime and predict a giant optical spin Hall effect. Namely, for certain transition metal elements, at particular frequencies, the spin current can be a significant fraction of the charge current, and even exceed it for XUV frequencies. By maximizing spin current while minimizing the charge current, we thus minimize a major source of heating in spintronic devices. We employ {\it ab-initio} time-dependent density functional theory (TDDFT), and with real-time simulations calculate the conductivity and transverse spin conductivity for all d, d, and d transition metals for frequencies up to eV. In the XUV frequency range we find values greater than for the spin Hall angle, indicating spin currents larger than the charge current can be generated.
Keywords
Cite
@article{arxiv.2204.01538,
title = {The Giant Spin Hall Effect at Optical Frequencies},
author = {P. Elliott and S. Shallcross and Sangeeta Sharma},
journal= {arXiv preprint arXiv:2204.01538},
year = {2022}
}