Island shape controls magic-size effect for heteroepitaxial diffusion
HH Wu and AW Signor and DR Trinkle, JOURNAL OF APPLIED PHYSICS, 108, 023521 (2010).
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. (C) 2010 American Institute of Physics. doi : 10.1063/1.3455848
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