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arXiv 1012.4507cond-mat.dis-nn
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随机周期介质中弹性弦在退钉阈值处的各向异性有限尺寸标度

Anisotropic finite-size scaling of an elastic string at the depinning threshold in a random-periodic medium

Sebastian Bustingorry, Alejandro B. Kolton

摘要:

我们数值研究了随机周期介质中受驱动的弹性弦在其依赖于样本的脱钉阈值时的几何形状。我们发现,各向异性的有限尺寸标度的平均平方宽度$\bar{w^2}$和其相关的概率分布都控制的比率$k=M/L^{ζ_{\mathrm{dep}}}$,其中$ζ_{\mathrm{dep}}$是随机流形脱钉粗糙度指数,$L$是纵向尺寸的字符串和$M$的随机介质的横向周期性。重新缩放的平均平方宽度$\bar{w^2}/L^{2ζ_{\mathrm{dep}}}$显示$k$的有限值的非平凡的单个最小值。我们发现,小$k$的初始减少反映了交叉在$k \sim 1$从随机周期随机流形粗糙度。非常大的$k$的增加意味着,越来越罕见的临界配置,伴随着交叉Gumbel临界力统计,显示异常粗糙度属性:横向周期性缩放,尽管$\bar{w^2} \ll M$,和subleading标准随机流形尺寸缩放的修正。我们的研究结果是相关的理解从界面到颗粒脱钉的尺寸交叉。

英文摘要:

We numerically study the geometry of a driven elastic string at its sample-dependent depinning threshold in random-periodic media. We find that the anisotropic finite-size scaling of the average square width $\bar{w^2}$ and of its associated probability distribution are both controlled by the ratio $k=M/L^{ζ_{\mathrm{dep}}}$, where $ζ_{\mathrm{dep}}$ is the random-manifold depinning roughness exponent, $L$ is the longitudinal size of the string and $M$ the transverse periodicity of the random medium. The rescaled average square width $\bar{w^2}/L^{2ζ_{\mathrm{dep}}}$ displays a non-trivial single minimum for a finite value of $k$. We show that the initial decrease for small $k$ reflects the crossover at $k \sim 1$ from the random-periodic to the random-manifold roughness. The increase for very large $k$ implies that the increasingly rare critical configurations, accompanying the crossover to Gumbel critical-force statistics, display anomalous roughness properties: a transverse-periodicity scaling in spite that $\bar{w^2} \ll M$, and subleading corrections to the standard random-manifold longitudinal-size scaling. Our results are relevant to understanding the dimensional crossover from interface to particle depinning.

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