We report systematic and accurate simulation studies of the diffusion coefficient (D) of two-dimensional clusters using a lattice model. For small cluster sizes, we observe a size dependence of D that is consistent with theoretical predictions for a periphery-diffusion mechanism. For larger sizes, we find a much weaker size dependence of D. This is in agreement with that seen in recent experimental studies of homoepitaxial, metal fcc(001) cluster diffusion. The weak size dependence of D for larger clusters correlates well with the concerted motion of kinks. We propose an expression to describe this behavior.
|Original language||English (US)|
|Number of pages||4|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - 1999|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics