Superdiffusive Motion of the Pb Wetting Layer on the Si(111) Surface

TitleSuperdiffusive Motion of the Pb Wetting Layer on the Si(111) Surface
Publication TypeJournal Article
Year of Publication2013
AuthorsMan KL, Tringides MC, Loy MMT, Altman MS
Journal TitlePhysical Review Letters
Volume110
Pages036104
Date Published01
Type of ArticleArticle
ISBN Number0031-9007
Accession NumberWOS:000313755000011
Keywordsdiffusion, dynamics, ISLANDS, metal-surfaces
Abstract

Mass transport in the Pb wetting layer on the Si(111) surface is investigated by observing non-equilibrium coverage profile evolution with low energy electron microscopy and microlow energy electron diffraction. Equilibration of an initial coverage step profile occurs by the exchange of mass between oppositely directed steep coverage gradients that each move with unperturbed shape. The bifurcation of the initial profile, the shape of the profile between the two moving edges, and the time dependence of equilibration are all at odds with expectations for classical diffusion behavior. These observations signal a very unusual coverage dependence of diffusion or may even reveal an exceptional collective super-diffusive mechanism. DOI: 10.1103/PhysRevLett.110.036104

URL<Go to ISI>://WOS:000313755000011