Karman vortex street in a two-component Bose-Einstein condensate
Karman vortex street in a two-component Bose-Einstein condensate
复制标题
二元玻色-爱因斯坦凝聚体中的卡门涡街
DOI：
10.1088/1367-2630/ab4d06
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发表时间：
2019
影响因子：
3.3
通讯作者：
Shi Yu Ren
中科院分区：
文献类型：
--
作者：
Li Xiao Lin;Yang Xue Ying;Tang Na;Song Lin;Zhou Zhi Kun;Zhang Juan;Shi Yu Ren
数值研究了双组分玻色-爱因斯坦凝聚体中移动障碍势引起的涡流脱落。对于由23个Na原子和87个Rb原子组成的双组分混相凝聚体，在障碍物后，在一个组分中发现Kármán涡旋街，在另一个组分中形成Kármán-like涡旋街，称为“半量子涡旋街”。其他的涡旋脱落模式，如涡旋偶极子、v形涡旋对和相应的“半量子涡旋脱落”，也可以被发现。计算并讨论了作用于障碍物势上的阻力。给出了各种涡型的参数区域和涡发射的临界速度。此外，还考虑了85 Rb - 87 Rb混合物，其中Kármán涡街和其他典型模式都存在于两组分中。最后，我们提供了上述实现和观察的实验方案。
Vortex shedding from a moving obstacle potential in a two-component Bose–Einstein condensate is investigated numerically. For a miscible two-component condensate composed of 23 Na and 87 Rb atoms, in the wake of obstacle, the Kármán vortex street is discovered in one component, while the Kármán-like vortex street named'half-quantum vortex street'is formed in another component. The other patterns of vortex shedding, such as the vortex dipoles, V-shaped vortex pairs and corresponding'half-quantum vortex shedding', can also be found. The drag force acting on obstacle potential is calculated and discussed. The parameter region for various vortex patterns and critical velocity for vortex emission are presented. In addition, a 85 Rb–87 Rb mixture is also considered, where the Kármán vortex street and other typical patterns exist in both components. Finally, we provide an experimental protocol for the above realization and observation.