Title

The crossover from collective motion to periphery diffusion for two-dimensional adatom-islands on Cu(111)

Authors

Authors

A. Karim; A. Kara; O. Trushin;T. S. Rahman

Comments

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Abbreviated Journal Title

J. Phys.-Condes. Matter

Keywords

VACANCY CLUSTERS; BROWNIAN-MOTION; 111 SURFACES; SIMULATIONS; MIGRATION; RH(100); GROWTH; Physics, Condensed Matter

Abstract

The diffusion of two-dimensional adatom-islands (up to 100 atoms) on Cu(111) has been studied, using the self-learning kinetic Monte Carlo method (Trushin et al 2005 Phys. Rev. B 72 115401). A variety of multiple-and single-atom processes are revealed in the simulations, and the size dependences of the diffusion coefficients and effective diffusion barriers are calculated for each. From the tabulated frequencies of events found in the simulation, we show a crossover from diffusion due to the collective motion of the island to a regime in which the island diffuses through periphery-dominated mass transport. This crossover occurs for island sizes between 13 and 19 atoms. For islands containing 19-100 atoms the scaling exponent is 1.5, which is in good agreement with previous work. The diffusion of islands containing 2-13 atoms can be explained primarily on the basis of a linear increase of the barrier for the collective motion with the size of the island.

Journal Title

Journal of Physics-Condensed Matter

Volume

23

Issue/Number

46

Publication Date

1-1-2011

Document Type

Article

Language

English

First Page

4

WOS Identifier

WOS:000296795400002

ISSN

0953-8984

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