Misfit-dislocation-mediated heteroepitaxial island diffusion |
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Authors: | AW Signor Henry H Wu Dallas R Trinkle |
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Institution: | Department of Materials Science and Engineering, University of Illinois, Urbana-Champaign, United States |
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Abstract: | Scanning tunneling microscopy combined with molecular dynamics simulations reveals a dislocation-mediated island diffusion mechanism for Cu on Ag(111), a highly mismatched system. Cluster motion is tracked with atomic precision at multiple temperatures and diffusion barriers and prefactors are determined from direct measurements of hop rates. The barrier to nucleate a dislocation is sensitive to island size and shape, resulting in a non-monotonic size dependence of the diffusion barrier. |
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