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Diffusion of two-dimensional epitaxial clusters on metal (100) surfaces: Facile versus nucleation-mediated behavior and their merging for larger sizes

TitleDiffusion of two-dimensional epitaxial clusters on metal (100) surfaces: Facile versus nucleation-mediated behavior and their merging for larger sizes
Publication TypeJournal Article
Year of Publication2017
AuthorsLai, KC, Liu, DJ, Evans, JW
JournalPhysical Review B
Volume96
Pagination235406
Date Published12
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000417076300004
Keywordsag(111), brownian-motion, dynamics, evolution, island diffusion, kinetics, mobility, monte-carlo, physics, shape, vacancy islands
Abstract

3/2, reflecting the quasifacetted structure of clusters, for larger N = O(10(2)) to N = O(10(3)); (v) classic scaling with beta = 3/2 for very large N = O(10(3)) and above. The specified size ranges apply for typical model parameters. We focus on the moderate size regime where we show that diffusivity cycles quasiperiodically from the slowest branch for N-p + 3 (not Np) to the fastest branch for N-p + 1. Behavior is quantified by kinetic Monte Carlo simulation of an appropriate stochastic lattice-gas model. However, precise analysis must account for a strong enhancement of diffusivity for short time increments due to back correlation in the cluster motion. Further understanding of this enhancement, of anomalous size scaling behavior, and of the merging of various branches, is facilitated by combinatorial analysis of the number of the ground-state and low-lying excited state cluster configurations, and also of kink populations.

DOI10.1103/PhysRevB.96.235406
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Chemical Physics