1999/08/31 by Miroslav Kotrla, Joachim Krug, Pavel Šmilauer +1
Chemistry · Physics and Astronomy · #Advanced Physical and Chemical Molecular Interactions #Physics of Superconductivity and Magnetism #Theoretical and Computational Physics #cond-mat.mtrl-sci
paper · pdf · doi:10.1016/s0039-6028(00)00251-x
7 pages, 2 postscript figures
arxiv created 1999/10/22 · openalex publication_date 2000/05/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We study the dynamics of island nucleation in the presence of adsorbates using kinetic Monte Carlo simulations of a two-species growth model. Adatoms (A-atoms) and impurities (B-atoms) are codeposited, diffuse and aggregate subject to attractive AA- and AB-interactions. Activated exchange of adatoms with impurities is identified as the key process to maintain decoration of island edges by impurities during growth. While the presence of impurities strongly increases the island density, a change in the scaling of island density with flux, predicted by a rate equation theory for attachment-limited growth [D. Kandel, Phys. Rev. Lett. 78, 499 (1997)], is not observed. We argue that, within the present model, even completely covered island edges do not provide efficient barriers to attachment.