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Submonolayer growth with decorated island edges | | Miroslav Kotrla
; Joachim Krug
; Pavel Smilauer
; | | Date: |
2 Aug 1999 | | Subject: | Materials Science | cond-mat.mtrl-sci | | Affiliation: | Institute of Physics Academy of Sciences of the Czech Republic, Praha, Czech Republic), Joachim Krug (Fachbereich Physik, Universitaet GH Essen, Germany) and Pavel Smilauer (Institute of Physics Academy of Sciences of the Czech Republic, Praha, Czech R | | Abstract: | 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. | | Source: | arXiv, cond-mat/9908026 | | Services: | Forum | Review | PDF | Favorites | |
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