Vector dark-antidark solitary waves in multicomponent Bose-Einstein condensates
Vector dark-antidark solitary waves in multicomponent Bose-Einstein condensates
复制标题
多组分玻色-爱因斯坦凝聚中的矢量暗-反暗孤立波
DOI：
10.1103/physreva.94.053617
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发表时间：
2016
影响因子：
2.9
通讯作者：
Kevrekidis, P. G.
中科院分区：
文献类型：
--
作者：
Danaila, I.;Khamehchi, M. A.;Gokhroo, V.;Engels, P.;Kevrekidis, P. G.
多组分玻色-爱因斯坦凝聚体呈现出各种有趣的非线性结构。在最近的理论工作中[C.Qu，L.P.Pitaevskii，S.Stringari，Phys.莱特牧师。116,160402(2016)PRLTAO0031-900710.1103/PhysRevLett.116.160402]，磁孤子的概念已经被引入。在这里，我们以多组分玻色-爱因斯坦凝聚体(BEC)中矢量暗-反暗孤立波的形式研究这一概念的变体。我们首先为原子BEC中的这些态提供了具体的实验证据，然后说明了这些态的更广泛的概念，这些概念是基于混相性和组元间排斥之间的相互作用。有了这个更一般的概念框架，我们将这种态的概念扩展到更高的维度，提出了涡旋反暗态和环-反暗环(暗孤子)态的可能性。利用Bogoliubov-de Gennes分析方法，我们进行了数值延拓研究，研究了这些态的存在性，并检验了它们的稳定性。发现暗-反暗态和涡旋-反暗态在较宽的参数范围内是稳定的。在环暗孤子的情况下，其中单分量环态是不稳定的，随着分量间耦合的增加，矢量实体似乎承担着越来越稳定的作用。
Multicomponent Bose-Einstein condensates exhibit an intriguing variety of nonlinear structures. In recent theoretical work [C. Qu, L. P. Pitaevskii, and S. Stringari, Phys. Rev. Lett. 116, 160402 (2016)PRLTAO0031-900710.1103/PhysRevLett.116.160402], the notion of magnetic solitons has been introduced. Here we examine a variant of this concept in the form of vector dark-antidark solitary waves in multicomponent Bose-Einstein condensates (BECs). We first provide concrete experimental evidence for such states in an atomic BEC and subsequently illustrate the broader concept of these states, which are based on the interplay between miscibility and intercomponent repulsion. Armed with this more general conceptual framework, we expand the notion of such states to higher dimensions presenting the possibility of both vortex-antidark states and ring-antidark-ring (dark soliton) states. We perform numerical continuation studies, investigate the existence of these states, and examine their stability using the method of Bogoliubov–de Gennes analysis. Dark-antidark and vortex-antidark states are found to be stable for broad parametric regimes. In the case of ring dark solitons, where the single-component ring state is known to be unstable, the vector entity appears to bear a progressively more and more stabilizing role as the intercomponent coupling is increased.