Formation and structure of vortex lattices in a rotating double-well Bose-Einstein condensate

Formation and structure of vortex lattices in a rotating double-well Bose-Einstein condensate
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旋转双井玻色-爱因斯坦凝聚中涡晶格的形成和结构

DOI:
10.7452/lapl.201210044
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发表时间:
2012-04
影响因子:
1.7
通讯作者:
罗小兵
罗小兵
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
文灵华;罗小兵

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我们研究了旋转双阱 (DW) 势内的玻色-爱因斯坦凝聚体中涡旋形成的动力学和涡旋晶格的结构。动力学过程是“幽灵”涡旋、“隐藏”涡旋和“可见”涡旋的形成过程。产生可见涡旋的临界旋转频率由角动量演化中的突然跳跃和能量演化中的拐点来​​指示。通过控制旋转频率可以形成不同的可见涡流结构。特别是,可见涡旋图案的结构变化可以通过调节 DW 势的各向异性参数来实现。这一特性允许灵活控制宏观量子系统中角动量的分布,并研究超流体中旋转、粒子间相互作用和外部势之间的相互作用。
We investigate the dynamics of vortex formation and the structure of vortex lattices in a Bose-Einstein condensate confined within a rotating double-well (DW) potential. The dynamical process is a formation process of ``ghost'' vortices, ``hidden'' vortices, and ``visible'' vortices. The critical rotation frequency for the creation of visible vortex is indicated by a sudden jump in the angular momentum evolution and an inflexion in the energy evolution. Different visible vortex structures can be formed by ruling the rotation frequency. In particular, structural change of visible vortex patterns can be achieved by regulating the anisotropy parameter of the DW potential. This feature allows to flexibly control the distribution of angular momentum in macroscopic quantum systems and study the interplay among rotation, interparticle interaction and external potential in superfluids.
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