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arXiv 1507.07409cond-mat.stat-mechcond-mat.dis-nnq-bio.SC
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无序介质中依赖于样本的首次穿越时间分布

Sample-dependent first-passage time distribution in a disordered medium

Liang Luo, Lei-Han Tang

摘要:

在两个维度以上,粒子在具有淬灭随机陷阱的介质中的扩散被认为是由退火连续时间随机游走(CTRW)很好地描述的。我们提出了一个近似表达式的首次通过时间(FPT)分布在一个给定的样本,使这两个问题的详细比较。对于一个有限大小的系统,深陷阱的数量和空间排列产生显着的样本到样本的FPT统计变化。数值模拟淬火陷阱模型与幂律逗留时间证实存在两个特征的时间尺度和非自平均FPT分布,理论预测。

英文摘要:

Above two dimensions, diffusion of a particle in a medium with quenched random traps is believed to be well-described by the annealed continuous time random walk (CTRW). We propose an approximate expression for the first-passage-time (FPT) distribution in a given sample that enables detailed comparison of the two problems. For a system of finite size, the number and spatial arrangement of deep traps yield significant sample-to-sample variations in the FPT statistics. Numerical simulations of a quenched trap model with power-law sojourn times confirm the existence of two characteristic time scales and a non-self-averaging FPT distribution, as predicted by theory.

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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