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The diffusion of two dimensional adatom islands (up to 100 atoms) on Cu(111)has been studied, using the self-learning Kinetic Monte Carlo (SLKMC) method[1]. A variety of multiple- and single-atom processes are revealed in thesimulations, and the size dependence of the diffusion coefficients andeffective diffusion barriers are calculated for each. From the tabulatedfrequencies of events found in the simulation, we show a crossover fromdiffusion due to the collective motion of the island to a regime in which theisland diffuses through periphery-dominated mass transport. This crossoveroccurs for island sizes between 13 and 19 atoms. For islands containing 19 to100 atoms the scaling exponent is 1.5, which is in good agreement with previouswork. The diffusion of islands containing 2 to 13 atoms can be explainedprimarily on the basis of a linear increase of the barrier for the collectivemotion with the size of the island.

The crossover from collective motion to periphery diffusion for 2D adatom-islands on Cu(111)