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arXiv 2305.03438nlin.PScond-mat.quant-gas
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交叉组合线性与非线性光学晶格中二维二元孤子的动力学自俘获

Dynamical self-trapping of two-dimensional binary solitons in cross-combined linear and nonlinear optical lattices

K. K. Ismailov, G. A. Sekh, Mario Salerno

AI总结:

本文研究交叉组合线性与非线性光学晶格中二维二元玻色-爱因斯坦凝聚孤子的动力学自俘获现象,通过变分分析和GPE数值模拟发现非线性光学晶格诱导的动力学势垒导致孤子在参数空间中被俘获,并展示了其在非平衡位置保持静止及抵抗重力下落的能力。

摘要:

本文对交叉组合晶格中二维(2D)二元玻色-爱因斯坦凝聚体(BECs)混合物的动力学与自俘获性质进行了分析和数值研究,其中第一种组分处于x方向的一维(1D)线性光学晶格(LOL)中,第二种组分处于y方向的一维非线性光学晶格(NOL)中。通过变分分析和耦合Gross-Pitaevskii方程(GPE)的直接数值积分,证明了在这些设置中二维二元物质波孤子的存在性和稳定性。我们发现,在没有NOL的情况下,由一维LOL的作用和吸引性的组分间相互作用所稳定的二元孤子可以在y方向自由移动。在存在NOL的情况下,我们非常显著地发现参数空间中存在阈值曲线,这些曲线将孤子能够移动的区域与孤子变得动力学自俘获的区域分隔开来。动力学自俘获现象(DSTP)背后的机制可以从NOL所诱导的动力学势垒的角度进行定性理解,该势垒类似于离散晶格中孤子的Peirls-Nabarro势垒。通过相位印刻以及施加在y方向的外部势场两种方式使二元孤子运动,数值上证明了DSTP。在后一种情况下,我们表明NOL的俘获作用使得二维二元孤子能够静止保持在抛物线势阱的非平衡位置,或者防止其在重力作用下下落。本文还简要讨论了这些结果的可能应用。

英文摘要:

Dynamical and self-trapping properties of two-dimensional (2D) binary mixtures of Bose-Einstein condensates (BECs) in cross-combined lattices consisting of a one-dimensional (1D) linear optical lattice (LOL) in the $x-$ direction for the first component and a 1D non linear optical lattice (NOL) in the $y$-direction for the second component, are analytically and numerically investigated. The existence and stability of 2D binary matter wave solitons in these settings is demonstrated both by variational analysis and by direct numerical integration of the coupled Gross-Pitaevskii equations (GPE). We find that in absence of the NOL binary solitons, stabilised by the action of the 1D LOL and by the attractive inter-component interaction can freely move in the $y-$direction. In the presence of the NOL we find, quite remarkably, the existence of threshold curves in the parameter space separating regions where solitons can move, from regions where the solitons become dynamically self-trapped. The mechanism underlying the dynamical self-trapping phenomenon (DSTP) is qualitatively understood in terms of a dynamical barrier induced by the the NOL similar to the Peirls-Nabarro barrier of solitons in discrete lattices. DSTP is numerically demonstrated for binary solitons that are put in motion both by phase imprinting and by the action of external potentials applied in the $y-$direction. In the latter case we show that the trapping action of the NOL allows maintaining a 2D binary soliton at rest in a non-equilibrium position of a parabolic trap, or to prevent it from falling under the action of gravity. Possible applications of the results are also briefly discussed.

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