Light can possess orbital angular momentum (OAM), in addition to spin angular momentum (SAM), which offers nearly infinite possible values of momentum states, allowing a wider degree of freedom for information processing and communications. The OAM of light induces a selection rule that obeys the law of conservation of angular momentum as it interacts with a material, affecting the material’s optical and electrical properties. In this work, silicon nanowire field-effect transistors are subjected to light with OAM, also known as twisted light. Electrical measurements on the devices consequently reveal photocurrent enhancements after incrementing the OAM of the incident light from 0ℏ (fundamental mode) to 5ℏ. Such a phenomenon is attributed to the enhancements of the photogating and the photoconductive effects under the influence of the OAM of light, the underlying mechanism of which is proposed and discussed using energy band diagrams. With these observations, a strategy for controlling photocurrent has been introduced, which can be a realization of the application in the field of optoelectronics technology.

中文翻译：

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硅纳米线场效应晶体管中的扭曲光感应光电流

除了自旋角动量 (SAM) 之外，光还可以拥有轨道角动量 (OAM)，它提供了几乎无限可能的动量状态值，从而为信息处理和通信提供了更大的自由度。光的 OAM 引入了一种选择规则，该规则在与材料相互作用时遵循角动量守恒定律，从而影响材料的光学和电学特性。在这项工作中，硅纳米线场效应晶体管受到 OAM 光的影响，也称为扭曲光。因此，在将入射光的 OAM 从 0ℏ（基本模式）增加到 5ℏ 后，对器件进行的电气测量显示光电流增强。这种现象归因于在光的OAM的影响下光门控和光电导效应的增强，使用能带图提出和讨论了其潜在机制。通过这些观察，引入了一种控制光电流的策略，可以实现在光电子技术领域的应用。