AI 中文总结
本研究提出光子自旋霍尔效应（PSHE）可作为非侵入式探针，通过质心位移的频率相关符号结构，明确检测时间反演对称性破缺的能带拓扑相。
AI 中文摘要
当平面偏振高斯光束入射到表面并发生反射时，会分裂为右旋和左旋圆偏振光束，二者在垂直于入射平面的方向上空间分离，这一现象被称为光子自旋霍尔效应（PSHE）。本研究表明，质心位移——即右旋和左旋圆偏振光束位移的强度加权平均值——可直接探测光学霍尔电导率，而该电导率承载着系统拓扑性质的关键信息。研究显示，质心位移随光频率变化的符号结构具有独特性，取决于系统处于时间反演对称性破缺的能带拓扑相还是平庸相。因此，PSHE可作为一种明确且非侵入式的探针，用于检测时间反演对称性破缺的能带拓扑相。
英文摘要
When a plane polarized Gaussian beam of light is incident on a surface, upon reflection it splits into right and left circularly polarized beams that are spatially separated in the direction perpendicular to the plane of incidence. This is known as the photonic spin-Hall effect (PSHE). In this work, we show that the centroid shift, which is the intensity weighted average of the shifts of the right and the left circularly polarized beams directly probes the optical Hall conductivity, which carries the essential information about the topological properties of the system. We show that the centroid shift as a function of the frequency of light has a unique sign structure depending on whether the system is in a time-reversal symmetry broken band topological phase or a trivial phase. Thus, the PSHE may serve as an unambiguous and a non-invasive probe to detect time-reversal symmetry broken band topological phases.
Comments6+8 pages, 3+8 figures
