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arXiv 0903.4878cond-mat.stat-mechcond-mat.dis-nn
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随机势场中弹性线的增长关联与老化

Growing correlations and aging of an elastic line in a random potential

José Luis Iguain, Sebastian Bustingorry, Alejandro B. Kolton, Leticia F. Cugliandolo

摘要:

通过数值求解Edwards-Wilkinson方程和固体-固体晶格模型的Monte Carlo动力学,研究了二维淬火随机势中有向弹性线的热辅助弛豫.我们发现,老化动力学是由一个不断增长的相关长度显示两个制度:一个初始的热为主的幂律增长跨越,在一个静态的温度相关长度$L_T \sim T^3$,对数增长符合代数增长的障碍。我们提出了一个尺度参数来处理交叉引起的几何和动力学效应。这种分析可以解释为什么大多数数值研究的结果,到目前为止已被描述与有效的幂律,也允许确定所观察到的异常的温度依赖性的特征生长指数。我们认为,类似的机制应该在其他无序系统的工作。我们推广的家庭Vicsek固定标度律来描述的粗糙度,通过将等待时间的依赖性或年龄的初始配置。两次线性响应和关联函数的分析表明,一个定义明确的有效温度存在于幂律区。最后,我们讨论了我们的研究结果的相关性,在高温超导体的涡旋玻璃的缓慢动力学。

英文摘要:

We study the thermally assisted relaxation of a directed elastic line in a two dimensional quenched random potential by solving numerically the Edwards-Wilkinson equation and the Monte Carlo dynamics of a solid-on-solid lattice model. We show that the aging dynamics is governed by a growing correlation length displaying two regimes: an initial thermally dominated power-law growth which crosses over, at a static temperature-dependent correlation length $L_T \sim T^3$, to a logarithmic growth consistent with an algebraic growth of barriers. We present a scaling arguments to deal with the crossover-induced geometrical and dynamical effects. This analysis allows to explain why the results of most numerical studies so far have been described with effective power-laws and also permits to determine the observed anomalous temperature-dependence of the characteristic growth exponents. We argue that a similar mechanism should be at work in other disordered systems. We generalize the Family-Vicsek stationary scaling law to describe the roughness by incorporating the waiting-time dependence or age of the initial configuration. The analysis of the two-time linear response and correlation functions shows that a well-defined effective temperature exists in the power-law regime. Finally, we discuss the relevance of our results for the slow dynamics of vortex glasses in High-Tc superconductors.

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