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arXiv 1302.3750cond-mat.stat-mech
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2+1维中的Kardar-Parisi-Zhang普适类:依赖于几何的普适分布和有限时间修正

Kardar-Parisi-Zhang universality class in 2+1 dimensions: Universal geometry-dependent distributions and finite-time corrections

Tiago J. Oliveira, Sidiney G. Alves, Silvio C. Ferreira

摘要:

在d=2+1的情况下,对Kardar-Parisi-Zhang(KPZ)普适类模型的动力学机制进行了广泛的模拟研究.我们发现了与一维Tracy-Widom分布不同的几何相关的普适分布,它表现出有限时间的修正,其特征是平均值随t^-β衰减,其中β是增长指数。我们的结果支持了将anzerh = vt+(Γt)^β x + η+ π t^-β推广到高维,其中v,Γ,π和η是非普适量,而β和χ是普适量,最后一个依赖于表面几何.广义Gumbel分布在峰值周围至少四个数量级上提供了非常好的分布拟合,可以用于与实验进行比较。我们的数值结果要求在二维系统中的KPZ类的分析方法和实验实现。

英文摘要:

The dynamical regimes of models belonging to the Kardar-Parisi-Zhang (KPZ) universality class are investigated in d=2+1 by extensive simulations considering flat and curved geometries. Geometry-dependent universal distributions, different from their Tracy-Widom counterpart in one-dimension, were found. Distributions exhibit finite-time corrections hallmarked by a shift in the mean decaying as t^-β, where βis the growth exponent. Our results support a generalization of the ansatz h = v t + (Γt)^βχ+ η+ ζt^-βto higher dimensions, where v, Γ, ζand ηare non-universal quantities whereas βand χare universal and the last one depends on the surface geometry. Generalized Gumbel distributions provide very good fits of the distributions in at least four orders of magnitude around the peak, which can be used for comparisons with experiments. Our numerical results call for analytical approaches and experimental realizations of KPZ class in two-dimensional systems.

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