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arXiv 1010.5271cond-mat.quant-gasnlin.PSphysics.optics
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一维光晶格支撑的玻色-爱因斯坦凝聚体中的三维间隙孤子

Three-dimensional gap solitons in Bose-Einstein condensates supported by one-dimensional optical lattices

A. Muñoz Mateo, V. Delgado, Boris A. Malomed

摘要:

在三维弱径向约束条件下研究了一维光晶格中物质波的基本能隙孤子和复合能隙孤子,该条件与玻色-爱因斯坦凝聚体中的实际实验条件相对应.在这一制度GS表现出非平凡的径向结构。与每个三维线性谱带相关联的是一族基本间隙孤子,它们与相应线性谱带的布洛赫波具有相似的横向结构。具有嵌入涡度$m$的GS可能存在对应于$m$的其它值的\emph{inside}带。稳定的高斯孤子,包括基本的和复合的(包括涡旋孤子),是那些起源于具有最低轴向和径向量子数的带。这些研究结果表明,在3D设置的实验生成强大的GS的情况下。

英文摘要:

We study fundamental and compound gap solitons (GSs) of matter waves in one-dimensional (1D) optical lattices (OLs) in a three-dimensional (3D) weak-radial-confinement regime, which corresponds to realistic experimental conditions in Bose-Einstein condensates (BECs). In this regime GSs exhibit nontrivial radial structures. Associated with each 3D linear spectral band exists a family of fundamental gap solitons that share a similar transverse structure with the Bloch waves of the corresponding linear band. GSs with embedded vorticity $m$ may exist \emph{inside} bands corresponding to other values of $m$. Stable GSs, both fundamental and compound ones (including vortex solitons), are those which originate from the bands with lowest axial and radial quantum numbers. These findings suggest a scenario for the experimental generation of robust GSs in 3D settings.

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