二维傍轴光流体中的湍流动力学
Turbulent dynamics in two-dimensional paraxial fluid of light
AI总结：
本文提出用二维傍轴光流体研究量子湍流，通过双反向流光精确制备初态并原位测量速度，揭示了动量空间各向同性、能量谱标度律及量子涡旋结构对代数指数的微观影响。
摘要：
量子流体中的湍流出人意料地与其经典对应物有许多共同之处。近年来，冷原子气体已成为研究湍流动力学的一个高度可控的实验平台。在这项工作中，我们引入了一种在光学中研究量子湍流的新系统，其主要优势在于能够利用适用于光场的大量表征工具。具体而言，我们报告了密度和相位的时间动力学，并展示了动量空间中各向同性的出现，以及不可压缩动能谱中不同标度律的存在。通过研究愈合长度内量子化涡旋的内部结构及其在更大长度尺度上的聚集，我们讨论了能量谱中代数指数的微观起源。这些结果是利用两股相向流动的光流体获得的，该方法能够精确制备初始状态，并对可压缩和不可压缩流体速度进行原位测量。
英文摘要：
Turbulence in quantum fluids has, surprisingly, a lot in common with its classical counterpart. Recently, cold atomic gases has emerged as a well controlled experimental platform to study turbulent dynamics. In this work, we introduce a novel system to study quantum turbulence in optics, with the major advantage of having access to a wide range of characterization tools available for light fields. In particular we report the temporal dynamics of density and phase and we show the emergence of isotropy in momentum space and the presence of different scaling laws in the incompressible kinetic energy spectrum. The microscopic origin of the algebraic exponents in the energy spectrum is discussed by studying the internal structure of quantized vortices within the healing length and their clustering at larger length scales. These results are obtained using two counter-streaming fluids of light, which allows for a precise preparation of the initial state and the in-situ measurement of the compressible and incompressible fluid velocity.
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