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arXiv 1806.04868nlin.PScond-mat.quant-gasphysics.optics
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空间受限自旋轨道耦合玻色-爱因斯坦凝聚体中的二维复合孤子

Two-dimensional composite solitons in Bose-Einstein condensates with spatially confined spin-orbit coupling

Yongyao Li, Xiliang Zhang, Rongxuan Zhong, Zhihuan Luo, Bin Liu, Chunqing Huang, Wei Pang, Boris A. Malomed

摘要:

近年来研究发现,自旋轨道耦合可以在二维自由空间中的旋量玻色-爱因斯坦凝聚体中产生稳定的物质波孤子。由于受外部激光照射的影响,有效的SO耦合也可以应用于空间受限的区域。利用数值方法和变分近似(VA),我们建立了半涡旋(SV)和混合模(MM)类型的二维孤子族,并探讨了它们的稳定性,假设SO耦合强度在径向上为高斯分布.最重要的结果是识别,通过VA和数值方法,的最小尺寸的空间限制的2D系统保持稳定的SV和MM类型的孤子。

英文摘要:

It was recently found that the spin-orbit (SO) coupling can help to create stable matter-wave solitons in spinor Bose-Einstein condensates in the two-dimensional (2D) free space. Being induced by external laser illumination, the effective SO coupling can be applied too in a spatially confined area. Using numerical methods and the variational approximation (VA), we build families of 2D solitons of the semi-vortex (SV) and mixed-mode (MM) types, and explore their stability, assuming that the SO-coupling strength is confined in the radial direction as a Gaussian. The most essential result is identification, by means of the VA and numerical methods, of the minimum size of the spatial confinement for which the 2D system maintains stable solitons of the SV and MM types.

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