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, $ic\mathrm{CD}$, as a differential photoemission observable and a natural probe of chiral electron states. Our findings render chiral crystals promising for spin-orbitronics applications.

中文翻译：

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CoSi 中手性驱动的轨道角动量和圆二色性

最近预测手性晶体和分子将为非常规轨道物理学形成一个有趣的平台。在这里，我们报告了在 CoSi（立方 B20 手性晶体家族的原型成员）的块状电子结构中观察到手性驱动的轨道纹理。利用软x射线角分辨光电发射中的圆二色性，我们证明了块状轨道角动量纹理的形成以及依赖于晶体旋向性的单极子轨道动量锁定。我们引入了固有的手性圆二色性，$我C\mathrm{光盘}$，作为可观测的微分光电子发射和手性电子态的天然探针。我们的研究结果表明手性晶体在自旋轨道电子学应用中很有前景。