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arXiv 2105.08032nlin.PScond-mat.soft
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环形暗孤子与涡旋及其它环的成对相互作用:Stationary States、稳定性特征及非线性动力学

Pairwise Interactions of Ring Dark Solitons with Vortices and other Rings: Stationary States, Stability Features and Nonlinear Dynamics

Wenlong Wang, Theodore Kolokolnikov, D. J. Frantzeskakis, R. Carretero-González, P. G. Kevrekidis

摘要:

在目前的工作中,我们探讨了解析和数值的共存和相互作用的环形暗孤子(RDS)与其他RDS,以及与涡旋。环的方位角不稳定性,探讨通过所谓的灯丝方法。由于它们的非线性相互作用,旋涡被发现在环上起稳定作用,但它们的作用不足以提供完全稳定的RDS。然而,完全稳定的相关配置可以实现外部环形势垒的存在下。多个环的相互作用也进行了探讨,并确定其平衡位置(由于其自身的曲率和尾巴的相互作用)。在这种情况下,稳定也是通过多环外部势垒实现的。

英文摘要:

In the present work, we explore analytically and numerically the co-existence and interactions of ring dark solitons (RDSs) with other RDSs, as well as with vortices. The azimuthal instabilities of the rings are explored via the so-called filament method. As a result of their nonlinear interaction, the vortices are found to play a stabilizing role on the rings, yet their effect is not sufficient to offer complete stabilization of RDSs. Nevertheless, complete stabilization of the relevant configuration can be achieved by the presence of external ring-shaped barrier potentials. Interactions of multiple rings are also explored, and their equilibrium positions (as a result of their own curvature and their tail-tail interactions) are identified. In this case too, stabilization is achieved via multi-ring external barrier potentials.

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