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arXiv 1409.7463cond-mat.stat-mech
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再论具有表面弛豫的随机沉积:从生长规则到Edwards-Wilkinson方程的途径

Revisiting random deposition with surface relaxation: approaches from growth rules to Edwards-Wilkinson equation

R. C. Buceta, D. Hansmann, B. von Haeften

摘要:

本文提出了几种从随机沉积表面弛豫(RDSR)模型导出粗粒连续Langevin方程(或Edwards-Wilkinson方程)的方法。首先,我们介绍了一种新的程序划分为三个基本过程的第一过渡时刻:沉积,扩散和体积守恒。我们展示了扩散过程与反对称贡献的关系,以及体积守恒过程与对称贡献的关系,对称贡献在粗粒度极限下重整化为零。在另一种方法中,我们通过正则化离散Langevin方程来找到连续Langevin方程的系数。最后,在第三种方法中,我们从离散模型的平稳概率密度函数(SPDF)所支持的测试函数集合中导出这些系数。所使用的方法的适用性,以其他离散随机沉积模型与瞬时松弛到相邻的网站进行了讨论。

英文摘要:

We present several approaches for deriving the coarse-grained continuous Langevin equation (or Edwards-Wilkinson equation) from a random deposition with surface relaxation (RDSR) model. First we introduce a novel procedure to divide the first transition moment into the three fundamental processes involved: deposition, diffusion and volume conservation. We show how the diffusion process is related to antisymmetric contribution and the volume conservation process is related to symmetric contribution, which renormalizes to zero in the coarse-grained limit. In another approach, we find the coefficients of the continuous Langevin equation, by regularizing the discrete Langevin equation. Finally, in a third approach, we derive these coefficients from the set of test functions supported by the stationary probability density function (SPDF) of the discrete model. The applicability of the used approaches to other discrete random deposition models with instantaneous relaxation to a neighboring site is discussed.

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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