Quantum modulation of island nucleation on top of a metal nanomesa

TitleQuantum modulation of island nucleation on top of a metal nanomesa
Publication TypeJournal Article
Year of Publication2008
AuthorsHan Y, Hupalo M, Tringides MC, Liu F
Journal TitleSurface Science
Date PublishedJan
Type of ArticleArticle
ISBN Number0039-6028
Accession NumberISI:000252904700011
Keywordsisland nucleation location, metal nanomesas, quantum size effect, size, states, surface diffusion, surfaces, thin-film growth

We present a theoretical analysis of selectivity of nucleation location for the two-dimensional island on top of a metal nanomesa. It has been observed experimentally that the nucleation can start either along the periphery of the mesa top or in the middle, depending on the mesa height. Such an intriguing nucleation behavior is shown to originate from the thickness-dependent mesa edge barrier for an adatom to jump off the mesa, which we attributed to be induced by the quantum size effect. Based on the experimentally observed nucleation locations, we estimate that the mesa edge barriers for the 5- and 6-layer Pb(1 1 1) mesas can differ by similar to 19 +/- 5 meV. (C) 2007 Elsevier B.V. All rights reserved.

Alternate JournalSurf. Sci.