基于量子几何带干涉的外尔半金属中的轨道霍尔效应
Orbital Hall Effect in Weyl Semimetals from quantum geometric band interference
AI总结：
本文针对TaAs家族外尔半金属，结合从头算密度泛函理论与最小外尔模型，揭示了轨道角动量输运、带几何与拓扑电子结构的直接联系，为理解轨道霍尔效应的微观机制提供了依据。
AI中文摘要：
固体中的轨道角动量（OAM）输运以轨道霍尔效应为突出表现，已成为可显著超越自旋对应现象的基本物理现象。然而，调控OAM动力学的微观机制仍仅被部分理解，尤其是带几何在轨道输运中的作用仍在很大程度上未得到解决。本文针对TaAs家族外尔半金属（TaAs、TaP、NbAs和NbP）研究该问题，这类材料具有成熟的拓扑结构及相关OAM纹理，是该研究方向的理想平台。采用从头算密度泛函理论，辅以基于绝热微扰理论的最小外尔模型，我们通过数值和解析两种方式建立了OAM输运、带几何与拓扑电子结构之间的直接关联。
英文摘要：
Orbital angular momentum (OAM) transport in solids, prominently manifested in the orbital Hall effect, has emerged as a fundamental phenomenon that can decisively exceed its spin-based counterparts. However, the microscopic mechanisms governing OAM dynamics remain only partially understood. In particular, the role of band geometry in orbital transport is still largely unresolved. Here we address this question in the TaAs family of Weyl semimetals, TaAs, TaP, NbAs, and NbP, whose well-established topology and associated OAM textures make them an ideal platform in this context. Using ab initio density functional theory, complemented by a minimal Weyl model based on adiabatic perturbation theory, we establish --- both numerically and analytically --- a direct link between OAM transport, band geometry, and topological electronic structure.
