巨声几何自旋和轨道霍尔效应

arXiv - PHYS - Classical Physics Pub Date : 2024-05-23 DOI:arxiv-2405.14202

Wei Wang, Yang Tan, Jingjing Liu, Bin Liang, Jianchun Cheng

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引用次数: 0

摘要

长期以来，人们一直认为具有自旋-0性质的流体中的声波不支持自旋霍尔效应和可用于实验观测的强轨道霍尔效应。在这里，我们首次从理论上解释并实验证明了以巨大横向位移为特征的巨型声学几何自旋和轨道霍尔效应。我们揭示了当从一个倾斜的参考框架中观测涡旋光束时会产生这种效应，而这个参考框架中不存在观测传统光束所需的波-面相互作用或梯度指数介质，并且可以通过简单地将光束紧密结合来放大这种效应。我们的工作为深入了解经典波的角动量物理学提供了新的视角。

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Giant Acoustic Geometric Spin and Orbital Hall Effect

Acoustic waves in fluid with spin-0 nature have been long believed not to support spin Hall effect and strong orbital Hall effect that enables experimental observation. Here we report the first theoretical explication and experimental demonstration of giant acoustic geometric spin and orbital Hall effect characterized by a large transverse shift. We reveal that this effect occurs when a vortex beam is observed from a tilted reference frame free of wave-interface interactions or gradient-index media needed for observing conventional ones, and can be amplified by simply binding the beam tightly. Thanks to this mechanism, large transverse shifts proportional to angular momentum are observed in a compact system. Our work provides deeper insights into the physics of angular momentum of classic waves.

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arXiv - PHYS - Classical Physics

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