Chirality-Driven Orbital Angular Momentum and Circular Dichroism in CoSi
Abstract
Chiral crystals and molecules were recently predicted to form an intriguing platform for unconventional orbital physics. Here, we report the observation of chirality-driven orbital textures in the bulk electronic structure of CoSi, a prototype member of the cubic B20 family of chiral crystals. Using circular dichroism in soft X-ray angle-resolved photoemission, we demonstrate the formation of a bulk orbital-angular-momentum texture and monopole-like orbital-momentum locking that depends on crystal handedness. We introduce the intrinsic chiral circular dichroism, icCD, as a differential photoemission observable and a natural probe of chiral electron states. Our findings render chiral crystals promising for spin-orbitronics applications.
Cite
@article{arxiv.2404.02952,
title = {Chirality-Driven Orbital Angular Momentum and Circular Dichroism in CoSi},
author = {Stefanie Suzanne Brinkman and Xin Liang Tan and Bjørnulf Brekke and Anders Christian Mathisen and Øyvind Finnseth and Richard Justin Schenk and Kenta Hagiwara and Meng-Jie Huang and Jens Buck and Matthias Kalläne and Moritz Hoesch and Kai Rossnagel and Kui-Hon Ou Yang and Minn-Tsong Lin and Guo-Jiun Shu and Ying-Jiun Chen and Christian Tusche and Hendrik Bentmann},
journal= {arXiv preprint arXiv:2404.02952},
year = {2024}
}
Comments
To be published in Physical Review Letters