The morphological stability of two-dimensional islands nucleated on a square-symmetry substrate during vacuum atom deposition is investigated by analytic scaling arguments and kinetic Monte Carlo simulations. It is shown that nonequilibrium, dendritic-skeletal island shapes may be converted into compact, equilibrium ones by increasing the deposition rate, in contrast with simple expectation. Our results imply that epitaxial islands generically should undergo a reentrant morphological transition with varying deposition rate. Stable, compact shapes should in principle exist only at intermediate values of the deposition rate.
|Original language||English (US)|
|Number of pages||7|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Jan 1 1999|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics