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arXiv 1504.00282cond-mat.quant-gasquant-ph
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光晶格中的分裂和重叠双孤子

Split and overlapped binary solitons in optical lattices

Golam Ali Sekh, Francesco V. Pepe, Paolo Facchi, Saverio Pascazio, Mario Salerno

摘要:

分析了在组合光晶格作用下,玻色-爱因斯坦凝聚体中的亮-亮(BB)孤子对的能量和动力学性质,其中BB孤子对作为第一类物质的外势,同时调制第二类物质的种内耦合常数.特别地,我们使用变分方法和直接数值积分来研究BB孤子的存在性和稳定性,其中两个物种是空间分离的(分裂孤子)或位于相同的光晶格位置(重叠孤子)。这些孤子的物种间相互作用参数的依赖性进行了明确的调查。对于排斥种间相互作用,我们表明存在一系列的临界值,在这些临界值处,发生从初始重叠孤子到分裂孤子的转变。对于种间吸引相互作用,只发现了从分裂到重叠BB孤子的单次直接跃迁,并提出了利用分裂孤子间接测量散射长度的可能性。

英文摘要:

We analyze the energetic and dynamical properties of bright-bright (BB) soliton pairs in a binary mixture of Bose-Einstein condensates subjected to the action of a combined optical lattice, acting as an external potential for the first species, while modulating the intraspecies coupling constant of the second. In particular, we use a variational approach and direct numerical integrations to investigate the existence and stability of BB solitons in which the two species are either spatially separated (split soliton) or located at the same optical lattice site (overlapped soliton). The dependence of these solitons on the interspecies interaction parameter is explicitly investigated. For repulsive interspecies interaction we show the existence of a series of critical values at which transitions from an initially overlapped soliton to split solitons occur. For attractive interspecies interaction only single direct transitions from split to overlapped BB solitons are found. The possibility to use split solitons for indirect measurements of scattering lengths is also suggested.

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