Coverage-Dependent Collective Diffusion of a Dense Pb Wetting Layer on Si(111)

TitleCoverage-Dependent Collective Diffusion of a Dense Pb Wetting Layer on Si(111)
Publication TypeJournal Article
Year of Publication2012
AuthorsHuang L, Wang CZ, Li MZ, Ho KM
Journal TitlePhysical Review Letters
Volume108
Pages026101
Date Published01
Type of ArticleArticle
ISBN Number0031-9007
Accession NumberWOS:000298991400019
Keywordsdynamics, frenkel-kontorova model, metals, SURFACE-DIFFUSION, TRANSPORT
Abstract

The dynamics of a dense Pb wetting layer on the Si(111) surface is studied in the framework of a generalized Frenkel-Kontorova model. Instead of the typical diffusion by random hopping processes, a liquidlike collective motion of the Pb atoms within the dense wetting layer is revealed to give rise to ultrafast kinetics of the wetting layer even at low temperatures. A kinetic Monte Carlo simulation including this collective spreading mechanism of the dense wetting layer quantitatively reproduces the experimental observations.

URL<Go to ISI>://WOS:000298991400019
DOI10.1103/PhysRevLett.108.026101
Alternate JournalPhys. Rev. Lett.