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arXiv 0806.3838nlin.PS
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正晶格孤子稳定性和不稳定性动力学的定性和定量分析

Qualitative and quantitative analysis of stability and instability dynamics of positive lattice solitons

Y. Sivan, G. Fibich, B. Ilan, M. I. Weinstein

摘要:

我们提出了一个统一的方法,定性和定量分析的稳定性和不稳定性动力学的正亮孤子在多维聚焦非线性介质中的潜在(晶格),它可以是周期性的,周期性的缺陷,准周期,单波导等,我们表明,当孤子是不稳定的,不稳定的动态发展的类型取决于这两个稳定性条件被违反。具体而言,违反斜率条件导致幅度不稳定性,而违反频谱条件导致漂移不稳定性。我们还提出了一个定量的方法,可以预测的稳定性和不稳定的强度。

英文摘要:

We present a unified approach for qualitative and quantitative analysis of stability and instability dynamics of positive bright solitons in multi-dimensional focusing nonlinear media with a potential (lattice), which can be periodic, periodic with defects, quasiperiodic, single waveguide, etc. We show that when the soliton is unstable, the type of instability dynamic that develops depends on which of two stability conditions is violated. Specifically, violation of the slope condition leads to an amplitude instability, whereas violation of the spectral condition leads to a drift instability. We also present a quantitative approach that allows to predict the stability and instability strength.

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