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Statistical mechanics of general discrete nonlinear Schr{'o}dinger models: Localization transition and its relevance for Klein-Gordon lattices

机译:一般离散非线性schr {\“o} dinger的统计力学   模型:本地化转换及其与Klein-Gordon格子的相关性

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摘要

We extend earlier work [Phys.Rev.Lett. 84, 3740 (2000)] on the statisticalmechanics of the cubic one-dimensional discrete nonlinear Schrodinger (DNLS)equation to a more general class of models, including higher dimensionalitiesand nonlinearities of arbitrary degree. These extensions are physicallymotivated by the desire to describe situations with an excitation threshold forcreation of localized excitations, as well as by recent work suggestingnon-cubic DNLS models to describe Bose-Einstein condensates in deep opticallattices, taking into account the effective condensate dimensionality.Considering ensembles of initial conditions with given values of the twoconserved quantities, norm and Hamiltonian, we calculate analytically theboundary of the 'normal' Gibbsian regime corresponding to infinite temperature,and perform numerical simulations to illuminate the nature of the localizationdynamics outside this regime for various cases. Furthermore, we showquantitatively how this DNLS localization transition manifests itself forsmall-amplitude oscillations in generic Klein-Gordon lattices of weakly coupledanharmonic oscillators (in which energy is the only conserved quantity), anddetermine conditions for existence of persistent energy localization over largetime scales.
机译:我们扩展了早期的工作[Phys.Rev.Lett。 84,3740(2000)]将立方一维离散非线性Schrodinger(DNLS)方程的统计力学归结为更通用的模型,包括更高的维度和任意程度的非线性。这些扩展是出于用局部阈值激发的激发阈值增量描述情况的渴望,以及最近的工作提出了非立方DNLS模型来描述深光学晶格中的玻色-爱因斯坦凝聚物,同时考虑了有效的凝聚物维数。在给定两个守恒量(范数和哈密顿量)的给定初始条件的基础上,我们分析地计算了对应于无限温度的``正常''吉布斯态的边界,并进行了数值模拟,以阐明在各种情况下该态之外的局部动力学的性质。此外,我们定量地显示了该DNLS局部转变如何在弱耦合非谐振荡器的通用Klein-Gordon晶格(其中能量是唯一的守恒量)中的小振幅振荡中表现出来,并确定了长期尺度上持久性能量局部存在的条件。

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  • 年度 2004
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