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arXiv 1202.2777cond-mat.quant-gas
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玻色-爱因斯坦凝聚体中的拍频暗-暗孤子

Beating dark-dark solitons in Bose-Einstein condensates

D. Yan, J. J. Chang, C. Hamner, M. Hoefer, P. G. Kevrekidis, P. Engels, V. Achilleos, D. J. Frantzeskakis, J. Cuevas

摘要:

受最近实验结果的启发,我们研究了双组分玻色-爱因斯坦凝聚体中出现的作为典型相干结构的拍频暗-暗孤子。我们展示了它们通过SO(2)旋转与暗-亮孤子的联系,并由此推断出它们的固有拍频和它们在抛物阱中的振荡频率。我们确定它们作为确切的周期轨道在Manakov限制的平等间和物种内的非线性强度与和没有陷阱,并展示了这种状态的持久性弱偏离此限制。我们还考虑了大的偏离Manakov极限,说明这种呼吸状态可能会被打破除了暗反暗孤子状态。最后,我们考虑了两个跳动的暗-暗孤子的动力学和相互作用的存在和不存在的陷阱,推断他们的典型的排斥作用。

英文摘要:

Motivated by recent experimental results, we study beating dark-dark solitons as a prototypical coherent structure that emerges in two-component Bose-Einstein condensates. We showcase their connection to dark- bright solitons via SO(2) rotation, and infer from it both their intrinsic beating frequency and their frequency of oscillation inside a parabolic trap. We identify them as exact periodic orbits in the Manakov limit of equal inter- and intra-species nonlinearity strengths with and without the trap and showcase the persistence of such states upon weak deviations from this limit. We also consider large deviations from the Manakov limit illustrating that this breathing state may be broken apart into dark-antidark soliton states. Finally, we consider the dynamics and interactions of two beating dark-dark solitons in the absence and in the presence of the trap, inferring their typically repulsive interaction.

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