Stefanie Suzanne BrinkmanXin Liang TanBjørnulf BrekkeAnders Christian MathisenØyvind FinnsethRichard Justin SchenkKenta HagiwaraMeng-Jie HuangJens BuckMatthias KalläneMoritz HoeschKai RossnagelKui-Hon Ou YangMinn-Tsong LinGuo-Jiun ShuYing-Jiun ChenChristian TuscheHendrik Bentmann2024-10-232024-10-232024-05-10https://scholars.lib.ntu.edu.tw/handle/123456789/722330Chiral 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.journal article10.1103/physrevlett.132.196402