发表机构
Indian Institute of Technology Kanpur（坎普尔印度理工学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究建立半经典理论分解轨道埃德斯坦效应的不同散射通道，发现磁化拉什巴二维电子气中无序诱导机制贡献超内在项，且轨道磁化强度比自旋磁化强度高一个数量级。
AI 中文摘要
通过外电场产生和操控轨道角动量（OAM）是轨道电子学的核心主题之一。其中，电诱导的非平衡OAM极化被称为轨道埃德斯坦效应（OEE），近年来受到广泛关注。尽管人们已充分理解OEE的内在带几何机制以及常规对称杂质散射的作用，但无序诱导的非对称散射的贡献仍不明确。本文建立了一种半经典理论，将OEE分解为内在、德鲁德、侧跳以及三阶和四阶偏散射通道。与德鲁德通道不同，内在、侧跳和偏散射响应仅在时间反演对称性破缺的系统中存在。我们发现，在磁化的拉什巴二维电子气（2DEG）中，这些无序诱导机制的贡献可显著超过内在贡献。值得注意的是，对于拉什巴耦合为1 eV·Å的系统，在所选参数下，轨道磁化强度比自旋磁化强度大约一个数量级，凸显了轨道自由度在埃德斯坦效应中的关键作用。
英文摘要
The generation and manipulation of orbital angular momentum (OAM) by an external electric field constitute one of the central themes of orbitronics. In particular, the electrically induced nonequilibrium OAM polarization, known as the orbital Edelstein effect (OEE), has attracted considerable attention in recent years. While the intrinsic band-geometric mechanism and the role of conventional symmetric impurity scattering in the OEE are well understood, the contribution from disorder-induced asymmetric scattering remains unclear. Here, we develop a semiclassical theory that separates the OEE into intrinsic, Drude, side-jump, and third- and fourth-order skew-scattering channels. Unlike the Drude channel, the intrinsic, side-jump, and skew-scattering responses survive only in systems with broken time-reversal symmetry. We find that in a magnetized Rashba two-dimensional electron gas (2DEG), these disorder-induced mechanisms can substantially exceed the intrinsic contribution. Remarkably, we find that for a system with Rashba coupling of $1$ $eV Å$, the orbital magnetization is about one order of magnitude larger than the spin magnetization for the chosen parameters, highlighting the crucial role of orbital degrees of freedom in the Edelstein effect.
Comments19 pages, 4 figures. We invite comments and feedback
