Chirality-Driven Orbital Angular Momentum and Circular Dichroism in CoSi
Journal
Physical Review Letters
Journal Volume
132
Journal Issue
19
Start Page
196402
ISSN
0031-9007
1079-7114
Date Issued
2024-05-10
Author(s)
Stefanie Suzanne Brinkman
Xin Liang Tan
Bjørnulf Brekke
Anders Christian Mathisen
Øyvind Finnseth
Richard Justin Schenk
Kenta Hagiwara
Meng-Jie Huang
Jens Buck
Matthias Kalläne
Moritz Hoesch
Kai Rossnagel
Kui-Hon Ou Yang
Guo-Jiun Shu
Ying-Jiun Chen
Christian Tusche
Hendrik Bentmann
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 monopolelike 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.
Publisher
American Physical Society (APS)
Type
journal article