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arXiv 1202.2906nlin.PS
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反连续极限下耦合DNLS方程的本征局域模

Intrinsic localized modes in coupled DNLS equations from the anti-continuum limit

K. Li, P. G. Kevrekidis, H. Susanto, V. Rothos

摘要:

在目前的工作中,我们概括了早期的考虑由几个激发站点的固有局域模式,如在一个组件的离散非线性薛定谔方程模型,两个组件系统的情况下开发。我们会考虑“上”的所有不同组合(零相位)和“向下”(π相位)位置激励,并且不仅能够计算相应的存在曲线,而且能够计算潜在地负责不稳定性的小特征值的特征值依赖性,作为表示自适应的模型的非线性参数的函数,光学中的交叉相位调制和光晶格中物质波的散射长度比。我们证实这些分析预测的直接数值计算。我们推断,所有的模式,承担两个相邻的节点具有相同的相位是不稳定的两个组件的情况下,可能是线性稳定的唯一的解决方案是那些在每个组件中的每一组相邻节点是相位。

英文摘要:

In the present work, we generalize earlier considerations for intrinsic localized modes consisting of a few excited sites, as developed in the one-component discrete nonlinear Schrodinger equation model, to the case of two-component systems. We consider all the different combinations of "up" (zero phase) and "down" (π phase) site excitations and are able to compute not only the corresponding existence curves, but also the eigenvalue dependences of the small eigenvalues potentially responsible for instabilities, as a function of the nonlinear parameters of the model representing the self/cross phase modulation in optics and the scattering length ratios in the case of matter waves in optical lattices. We corroborate these analytical predictions by means of direct numerical computations. We infer that all the modes which bear two adjacent nodes with the same phase are unstable in the two component case and the only solutions that may be linear stable are ones where each set of adjacent nodes, in each component is out of phase.

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