Creation and characterization of vortex clusters in atomic Bose-Einstein condensates
Creation and characterization of vortex clusters in atomic Bose-Einstein condensates
复制标题
DOI：
10.1103/physreva.86.013635
复制
发表时间：
2012-07-23
影响因子：
2.9
通讯作者：
Proukakis, Nick P.
中科院分区：
文献类型：
--
作者：
White, Angela C.;Barenghi, Carlo F.;Proukakis, Nick P.
我们展示了一个移动的障碍物，以一个细长的桨的形式，可以在二维（2D）玻色-爱因斯坦凝聚体中产生分散的漩涡或诱导类似符号的漩涡簇。我们提出了基于Ripley’s K函数的聚类统计度量，该度量适用于原子凝聚体中小尺寸和小数量的涡旋，这些涡旋缺乏较大的经典和量子湍流系统中激发的大量长度尺度。利用这些度量分析了聚类的演化和衰减。实验证明，用激光束和移动的光学掩模制造这样的障碍物是可能的。我们提出的理论技术可供实验学家使用，并扩展了目前可用的方法来诱导玻色-爱因斯坦凝聚体中的二维量子湍流。
We show that a moving obstacle, in the form of an elongated paddle, can create vortices that are dispersed or induce clusters of like-signed vortices in two-dimensional (2D) Bose-Einstein condensates. We propose statistical measures of clustering based on Ripley's K function which are suitable to the small size and small number of vortices in atomic condensates, which lack the huge number of length scales excited in larger classical and quantum turbulent fluid systems. The evolution and decay of clustering is analyzed using these measures. Experimentally it should prove possible to create such an obstacle by a laser beam and a moving optical mask. The theoretical techniques we present are accessible to experimentalists and extend the current methods available to induce 2D quantum turbulence in Bose-Einstein condensates.