Misfit-Dislocation-Mediated Heteroepitaxial Island Diffusion

Details Misfit-Dislocation-Mediated Heteroepitaxial Island Diffusion Misfit-Dislocation-Mediated Heteroepitaxial Island Diffusion

2009-08-20

arxiv.org/abs/0908.3004v2

Physics

Condensed Matter

Materials Science

Scientific paper

Scanning tunneling microscopy combined with molecular dynamics simulations reveal 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 non-monotonic size dependence of the diffusion barrier is in good agreement with simulations and can lead to enhanced mass transport upon coarsening, in surprising contrast to the traditional island diffusion models where diffusivity reduces with cluster size.

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