Phys. Rev. Lett. 98, 096106 (2007) [4 pages]How Pb-Overlayer Islands Move Fast Enough to Self-Assemble on Pb-Cu Surface AlloysReceived 31 October 2006; published 2 March 2007 Low-energy electron microscopy reveals that two-dimensional, ∼50 000 atom, Pb-overlayer and vacancy islands both have diffusion coefficients of 25.6±0.8 nm2/sec at 400 °C on Pb-Cu surface alloys. This high mobility, key to self-assembly in this system, results from the fast transport of Pb atoms on the surface alloy and of Cu through the Pb overlayer. A high Pb vacancy concentration, predicted by ab initio calculations, facilitates the latter. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.096106
DOI:
10.1103/PhysRevLett.98.096106
PACS:
68.35.Fx, 68.37.Nq, 68.43.Jk, 81.16.Dn
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