Abstract
The transition from nucleation to step-flow growth in surfactant mediated homoepitaxy is considered assuming exchange-deexchange kinetics on terraces. It is shown that the critical terrace width above which nucleation takes place displays an Arrhenius behavior. The square of the critical terrace width scales with the atom arrival rate, the scaling exponents being the same that determine the scaling behavior of the island densities in the submonolayer regime of growth.
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