Dynamics of vortices followed by the collapse of ring dark solitons in a two-component Bose-Einstein condensate
Dynamics of vortices followed by the collapse of ring dark solitons in a two-component Bose-Einstein condensate
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二元玻色-爱因斯坦凝聚中环暗孤子塌缩后的涡旋动力学
DOI：
10.1103/physreva.97.063607
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发表时间：
2018
影响因子：
2.9
通讯作者：
Xiao-Fei Zhang
中科院分区：
文献类型：
--
作者：
Lin-Xue Wang;Chao-Qing Dai;Lin Wen;Tao Liu;Hai-Feng Jiang;Hiroki Saito;Shou-Gang Zhang;Xiao-Fei Zhang
我们探讨了系统参数对二元玻色-爱因斯坦凝聚体 (BEC) 中环暗孤子 (RDS) 和涡旋以及 RDS 塌缩动力学的影响。该系统表现出复杂的动力学行为，与标量 BEC 中的系统有很大不同。对于两个初始深度相等的浅RDS，生成的涡旋偶极子的动力学轨迹与标量BEC中的动力学轨迹相似，但涡旋偶极子执行周期运动的时间增加。特别是，存在一个临界深度，在该深度之上，涡旋偶极子首先沿垂直方向移动，然后执行复杂的动力学，包括它们的重排和重组。最后，我们考虑初始深度不等的情况，发现产生的涡旋数量由浅层 RDS 的深度决定，而它们的初始移动方向由较深的 RDS 决定。
We explore the effects of system parameters on the dynamics of ring dark solitons (RDSs) and vortices followed by the collapse of RDSs in a two-component Bose-Einstein condensate (BEC). The system exhibits complicated dynamical behaviors, which are quite different from those in a scalar BEC. For two shallow RDSs with equal initial depths, the dynamical trajectories of generated vortex dipoles are similar to those in a scalar BEC, but the time for vortex dipoles to perform a periodic motion is increased. In particular, there exists a critical depth, above which vortex dipoles first move along the vertical direction and then preform complicated dynamics, including their rearrangement and recombination. Finally, we consider the case of unequal initial depths and find that the number of created vortices is determined by the depth of the shallow RDS, while their initial moving direction is determined by the deeper one.