Chirality-Driven Orbital Angular Momentum and Circular Dichroism in CoSi
Brinkman, Stefanie Suzanne; Tan, Xin Liang; Brekke, Bjørnulf; Mathisen, Anders Christian; Finnseth, Øyvind; Schenk, Richard Justin; Hagiwara, Kenta; Huang, Meng-Jie; Buck, Jens; Kalläne, Matthias; Hoesch, Moritz; Rossnagel, Kai; Ou Yang, Kui-Hon; Lin, Minn-Tsong; Shu, Guo-Jiun; Chen, Ying-Jiun; Tusche, Christian; Bentmann, Hendrik
Peer reviewed, Journal article
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2024Metadata
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- Institutt for fysikk [2836]
- Institutt for materialteknologi [2740]
- Publikasjoner fra CRIStin - NTNU [41088]
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, 𝑖�𝑐�CD, as a differential photoemission observable and a natural probe of chiral electron states. Our findings render chiral crystals promising for spin-orbitronics applications.