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s Staircase transformation on a Pb/Si(111) wetting layer

Titles Staircase transformation on a Pb/Si(111) wetting layer
Publication TypeJournal Article
Year of Publication2015
AuthorsWang, LL, Johnson, DD, Tringides, MC
JournalPhysical Review B
Volume92
Pagination245405
Date Published12
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000365779600007
KeywordsC-60, electron-gas, total-energy calculations, wave basis-set
Abstract

(DS) phases on the Pb/Si(111) wetting layer at low temperature (similar to 110 K). The formation energies of vacancy clusters are calculated in C-60/Pb/Si(111) as Pb atoms are progressively ejected from the initial dense Pb wetting layer. Vacancy clusters larger than five Pb atoms are found to be stable with seven being the most stable, while vacancy clusters smaller than five are highly unstable, which agrees well with the observed ejection rate of similar to 5 Pb atoms per C-60. The high energy cost (similar to 0.8 eV) for the small vacancy clusters to form indicates convincingly that the unusually fast transformation observed experimentally between the DS phases, upon C-60 adsorption at low temperature, cannot be the result of single-atom random walk diffusion but of correlated multi-atom processes.

DOI10.1103/PhysRevB.92.245405
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Surface Structures

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LDRD

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Mapping and Manipulating