合成磁场中的涡旋声束
Acoustic vortex beams in synthetic magnetic fields
摘要：
本文分析了涡旋声束在纵向合成磁场中的传播。我们展示了如何产生两个领域的配置使用循环缸中的流体：一个统一的合成磁场托管拉盖尔-高斯模式，和阿哈罗诺夫玻姆通量管托管贝塞尔光束。对于非傍轴光束，我们发现定性的差异，充分研究的情况下，电子涡旋光束在磁场，由于声波的速度场的矢量性质。特别地，声波的压力和速度分量可以分别对束轨道角动量和磁场的相对符号敏感。我们的研究结果说明了光学，电子和声学涡旋光束之间的类比如何在外部矢量势的存在下预锻。
英文摘要：
We analyze propagation of acoustic vortex beams in longitudinal synthetic magnetic fields. We show how to generate two field configurations using a fluid contained in circulating cylinders: a uniform synthetic magnetic field hosting Laguerre-Gauss modes, and an Aharonov-Bohm flux tube hosting Bessel beams. For non-paraxial beams we find qualitative differences from the well-studied case of electron vortex beams in magnetic fields, arising due to the vectorial nature of the acoustic wave's velocity field. In particular, the pressure and velocity components of the acoustic wave can be individually sensitive to the relative sign of the beam orbital angular momentum and the magnetic field. Our findings illustrate how analogies between optical, electron, and acoustic vortex beams can break down in the presence of external vector potentials.
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