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arXiv 0904.1833nlin.PS
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具有竞争偶极和局域相互作用的准一维玻色-爱因斯坦凝聚体中的孤子

Solitons in quasi one-dimensional Bose-Einstein condensates with competing dipolar and local interactions

J. Cuevas, Boris A. Malomed, P. G. Kevrekidis, D. J. Frantzeskakis

摘要:

我们研究了由接触竞争和偶极-偶极(DD)相互作用支持的一维物质波明孤子族。在自由空间和存在光晶格(OL)的情况下,发现了孤子族,并研究了它们的稳定性。当DD排斥力的强度一定时,自由空间孤子可以存在任意弱的局部吸引力。在DD吸引的情况下,孤子不存在超过本地排斥强度的最大值。在包括OL的系统中,在第二有限带隙中发现\textit{subfundamental solitons}(SFS)的稳定区域。在吸引DD相互作用下,间隙孤子(GS)的存在要求接触排斥足够强。在相反的情况下,DD排斥,GS存在,如果接触吸引力不是太强。研究了自由空间中孤子间的碰撞。在局部吸引的情况下,它们分别以小的和大的速度合并或穿过彼此。在局域斥力的存在下,慢运动的孤子会相互反弹。

英文摘要:

We study families of one-dimensional matter-wave bright solitons supported by the competition of contact and dipole-dipole (DD) interactions of opposite signs. Soliton families are found, and their stability is investigated in the free space, and in the presence of an optical lattice (OL). Free-space solitons may exist with an arbitrarily weak local attraction if the strength of the DD repulsion is fixed. In the case of the DD attraction, solitons do not exist beyond a maximum value of the local-repulsion strength. In the system which includes the OL, a stability region for \textit{subfundamental solitons} (SFSs) is found in the second finite bandgap. For the existence of gap solitons (GSs) under the attractive DD interaction, the contact repulsion must be strong enough. In the opposite case of the DD repulsion, GSs exist if the contact attraction is not too strong. Collisions between solitons in the free space are studied too. In the case of the local attraction, they merge or pass through each other at small and large velocities, respectively. In the presence of the local repulsion, slowly moving solitons bounce from each other.

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