Ultrafast kinetics in Pb/Si(111) from the collective spreading of the wetting layer

TitleUltrafast kinetics in Pb/Si(111) from the collective spreading of the wetting layer
Publication TypeJournal Article
Year of Publication2007
AuthorsHupalo M, Tringides MC
Journal TitlePhysical Review B
Volume75
Pages235443
Date PublishedJun
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000247624900148
Keywordsfilms, growth, pb, si(111)
Abstract

Although quantum size effects in Pb/Si(111) control the selection of uniform island heights, the fast formation time (after deposition of few minutes at T similar to 180 K) has been puzzling so far. By studying the island growth in stepwise deposition experiments, we demonstrate the important role of the wetting layer in the kinetics. Pb is transferred to unstable islands, not by independent atom hops, but by the continuous spreading of the wetting layer from the surrounding area to the island top. As Pb is moved to the top in ring-like morphology the underlying 7x7 reconstruction in the surrounding area emerges gradually.

DOI10.1103/PhysRevB.75.235443
Alternate JournalPhys. Rev. B