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
Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology, 7491 Trondheim, Norway.
Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich, Jülich 52425, Germany.
Phys Rev Lett. 2024 May 10;132(19):196402. doi: 10.1103/PhysRevLett.132.196402.
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.
手性晶体和分子最近被预测会形成一个用于非常规轨道物理的有趣平台。在此，我们报告在立方B20手性晶体家族的原型成员CoSi的体电子结构中对手性驱动的轨道纹理的观测。利用软X射线角分辨光电子能谱中的圆二色性，我们证明了一种依赖于晶体手性的体轨道角动量纹理和单极子状轨道动量锁定的形成。我们引入本征手性圆二色性（icCD）作为一种可观测的差分光电子发射和手性电子态的天然探针。我们的发现使手性晶体在自旋轨道电子学应用方面颇具前景。
