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arXiv 1108.0544cond-mat.stat-mech
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binding energies连续分布无序表面上的扩散限制反应

Diffusion-limited reactions on disordered surfaces with continuous distributions of binding energies

A. Wolff, I. Lohmar, J. Krug, O. Biham

摘要:

我们研究了二维晶格上随机粒子系统的稳态,其中粒子流入、扩散和解吸,以及粒子相遇时二聚体的形成。表面过程是热激活的,具有从\emph{continuous}分布提取的(淬灭)结合能。我们表明,在这个模型中的网站提供覆盖或流动性,这取决于他们的能量。我们用这个分析映射到一个有效的\emph{binary}模型中的温度依赖的方式系统。有效模型的行为是很好理解的,并且准确地描述了系统的关键量:与离散分布相比,有效反应的温度窗口被加宽,并且效率在其末端衰减得更慢。映射还解释了在什么参数制度的系统表现出实现依赖性。

英文摘要:

We study the steady state of a stochastic particle system on a two-dimensional lattice, with particle influx, diffusion and desorption, and the formation of a dimer when particles meet. Surface processes are thermally activated, with (quenched) binding energies drawn from a \emph{continuous} distribution. We show that sites in this model provide either coverage or mobility, depending on their energy. We use this to analytically map the system to an effective \emph{binary} model in a temperature-dependent way. The behavior of the effective model is well-understood and accurately describes key quantities of the system: Compared with discrete distributions, the temperature window of efficient reaction is broadened, and the efficiency decays more slowly at its ends. The mapping also explains in what parameter regimes the system exhibits realization dependence.

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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