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arXiv 0801.2337cond-mat.othernlin.PS
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玻色-爱因斯坦凝聚体中的共生能隙和半能隙孤子

Symbiotic gap and semi-gap solitons in Bose-Einstein condensates

Sadhan K. Adhikari, Boris A. Malomed

摘要:

利用变分近似和数值模拟方法,研究了囚禁在光格势中的二元玻色-爱因斯坦凝聚体中的一维带隙孤子。我们考虑种间排斥的情况,而种内相互作用可能是排斥的,也可能是吸引的。几种类型的间隙孤子被发现:对称或不对称;未分裂或分裂,如果组件的中心重合或分离;内间隙(与两个化学势落入一个单一的带隙)或间隙,否则。在种内吸引的情况下,在半无限隙中的孤子、在第一有限隙中的孤子和半隙孤子(其中一个分量在带隙中,另一个分量在半无限隙中)之间发生平滑过渡。

英文摘要:

Using the variational approximation and numerical simulations, we study one-dimensional gap solitons in a binary Bose-Einstein condensate trapped in an optical-lattice potential. We consider the case of inter-species repulsion, while the intra-species interaction may be either repulsive or attractive. Several types of gap solitons are found: symmetric or asymmetric; unsplit or split, if centers of the components coincide or separate; intra-gap (with both chemical potentials falling into a single bandgap) or inter-gap, otherwise. In the case of the intra-species attraction, a smooth transition takes place between solitons in the semi-infinite gap, the ones in the first finite bandgap, and semi-gap solitons (with one component in a bandgap and the other in the semi-infinite gap).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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