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arXiv 1802.01671cond-mat.quant-gasnlin.PS
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玻色-爱因斯坦凝聚体中矢量孤子的拍频效应

Beating Effects of Vector Solitons in Bose-Einstein Condensate

Li-Chen Zhao

摘要:

研究了多组分耦合玻色-爱因斯坦凝聚体中孤子的拍频效应。分析表明,拍频行为的周期由孤子在有效量子阱中诱导的能量本征值差决定,拍频模式由参与拍频行为的量子阱本征态决定.研究表明,在某些量子阱中,拍频孤子对应于本征态的线性叠加,而在吸引作用凝聚和排斥作用凝聚中,拍频孤子的对应关系是一致的.这为基于量子本征态知识统一理解吸引和排斥相互作用情形下孤子的拍频效应提供了可能。此外,我们的结果显示了三分量耦合凝聚体中孤子的许多不同的拍频模式,与之前报道的暗孤子拍频模式形成鲜明对比。拍频行为可以用来检验某些特定量子阱的本征值差异,并期望在更多组分耦合的体系中存在更丰富的拍频模式。

英文摘要:

We study the beating effects of solitons in multi-component coupled Bose-Einstein condensate systems. Our analysis indicate that the period of beating behavior is determined by the energy eigenvalue difference in the effective quantum well induced by solitons, and the beating pattern is determined by the eigen-states of quantum well which are involved in the beating behavior. We show that the beating solitons correspond to linear superpositions of eigen-states in some quantum wells, and the correspondence relations are identical for solitons in both attractive interaction and repulsive interaction condensate. This provides a possible way to understand the beating effects of solitons for attractive and repulsive interaction cases in a unified way, based on the knowledge of quantum eigen-states. Moreover, our results demonstrate many different beating patterns for solitons in three-component coupled condensate, in sharp contrast to the beating dark soliton reported before. The beating behavior can be used to test the eigenvalue differences of some certain quantum wells, and more abundant beating patterns are expected to exist in more components coupled systems.

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