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arXiv 1002.3470cond-mat.dis-nn
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具有不同非线性度的无序晶格中的扩散

Spreading in Disordered Lattices with Different Nonlinearities

M. Mulansky, A. Pikovsky

摘要:

我们研究了具有随机在位势的非线性薛定谔方程所描述的非线性无序晶格中初始局域态的扩展--这是局域化的Anderson模型的非线性推广。我们使用非线性扩散方程来描述亚扩散。为了证实演化的自相似性质,我们借助雷尼熵,特别是结构熵来表征扩展态的峰结构。后者被证明在很宽的时间范围内保持不变。此外,我们报告的扩展指数的非线性指数在广义非线性薛定谔无序晶格的依赖关系,并表明这些数量是按照以前的理论估计,基于弱和非常弱的混沌动力学的假设。

英文摘要:

We study the spreading of initially localized states in a nonlinear disordered lattice described by the nonlinear Schrödinger equation with random on-site potentials - a nonlinear generalization of the Anderson model of localization. We use a nonlinear diffusion equation to describe the subdiffusive spreading. To confirm the self-similar nature of the evolution we characterize the peak structure of the spreading states with help of Rényi entropies and in particular with the structural entropy. The latter is shown to remain constant over a wide range of time. Furthermore, we report on the dependence of the spreading exponents on the nonlinearity index in the generalized nonlinear Schrödinger disordered lattice, and show that these quantities are in accordance with previous theoretical estimates, based on assumptions of weak and very weak chaoticity of the dynamics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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