Island shape controls magic-size effect for heteroepitaxial diffusion

Henry H. Wu, A. W. Signor, Dallas R. Trinkle

Research output: Contribution to journalArticlepeer-review


Lattice mismatch of Cu on Ag(111) produces fast diffusion for "magic sizes" of islands. A size- and shape-dependent reptation mechanism is responsible for low diffusion barriers. Initiating the reptation mechanism requires a suitable island shape, not just magic sizes. Shape determines the dominant diffusion mechanism and leads to multiple clearly identifiable magic-size trends for diffusion depending on the number of atoms whose bonds are shortened during diffusion, which ultimately affects the self-assembly of islands.

Original languageEnglish (US)
Article number023521
JournalJournal of Applied Physics
Issue number2
StatePublished - Jul 15 2010

ASJC Scopus subject areas

  • General Physics and Astronomy


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