Anomalous Mass Transport in the Pb Wetting Layer on the Si(111) Surface

TitleAnomalous Mass Transport in the Pb Wetting Layer on the Si(111) Surface
Publication TypeJournal Article
Year of Publication2008
AuthorsMan KL, Tringides MC, Loy MMT, Altman MS
Journal TitlePhysical Review Letters
Date Published11/01
Type of ArticleArticle
ISBN Number0031-9007
Accession NumberISI:000261214400029
Keywordsfilms, growth, HEIGHT, ISLANDS

The temporal evolution of nonequilibrium coverage profiles in the Pb wetting layer on the Si(111) surface is studied using low energy electron microscopy. The initial coverage step profile propagates rapidly at a constant velocity with an unperturbed shape. A model is proposed that attributes this nonclassical equilibration behavior to the diffusion of thermally generated adatoms on top of the wetting layer. This model can account for the observed convectionlike mass transport, as well as its dramatic dependence on Pb coverage. Such anomalous mass transport is believed to facilitate the remarkably efficient self-organization of uniform Pb quantum island height on the Si(111) surface that was observed previously.

Alternate JournalPhys. Rev. Lett.