对称破缺导致的自旋霍尔效应研究

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中图分类号：O431.1；O436.1文献标志码：A

The spin Hall effect induced by symmetry breaking

DENG Zhenbin，GENG Tao （School of Optical-Electrical and Computer Engineering， University of Shanghai for Science and Technology， Shanghai 200093， China）

Abstract： This study systematically investigates the spin Hall effect induced by symmetry breaking in tightly focused radially polarized vortex beams. For beams without a vortex phase， the results demonstrate that the introduction of symmetry breaking not only significantly alters the intensity， phase，and polarization distributions of the focal spot but also splits the focal spot into two sub-spots symmetrically distributed along the central axis. The polarization state transitions from an initial radial distribution to an elliptically hybridized distribution， leading to pronounced localization of the longitudinal spin angular momentum （i.e.， the spin Hall effect）， while the localization degree of the transverse spin angular momentum is weakened. When a vortex phase is incorporated， symmetry breaking induces an eccentric intensity distribution in the focal spot， with this phenomenon intensifying as the topological charge increases.Notably， the localization of the xcomponent of the transverse spin angular momentum is reduced under these conditions， whereas the y-component exhibits enhanced localization. Further analysis reveals that symmetry breaking promotes a more concentrated distribution of the right-handed circularly polarized electric field component， thereby amplifying the spin Hall effect and increasing the valley depth of the longitudinal spin angular momentum. The findings aim to provide novel theoretical insights into spin-orbit interactions in tightly focused optical fields.

Keywords： symmetry breaking; tight focusing; localization of spin angular momentum

光具有波粒二象性，即波动性和粒子性。（剩余8971字）