Saturation and scaling of epitaxial island densities
- School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States)
- The Blackett Laboratory, Imperial College, London SW7 2BZ (United Kingdom)
The aggregation of adatoms into 2D islands is studied as a function of coverage [ital FTHETA] and the ratio of surface diffusion rate to deposition rate [ital gerR]=[ital D]/[ital F] by Monte Carlo simulations of a model of epitaxial growth that permits atoms to detach from island edges at a rate determined by a pair bond energy [ital E][sub [ital N]]. The total island density is observed to saturate before coalescence becomes important. In this regime, the density of adatoms [ital N][sub 1][similar to][ital FTHETA][sup [minus][ital r]][ital gerR][sup [minus][omega]] while the density of islands composed of [ital s][gt]1 atoms [ital N][sub [ital s]][similar to][ital FTHETA][l angle][ital s][r angle][sup [minus]2][ital g]([ital s]/[l angle][ital s][r angle]) where the average island size [l angle][ital s][r angle][similar to][ital FTHETAgerR][sup [ital x]]. The exponents [ital r], [omega], and [chi] vary smoothly with [ital E][sub [ital N]].
- DOE Contract Number:
- FG05-88ER45369
- OSTI ID:
- 7271545
- Journal Information:
- Physical Review Letters; (United States), Vol. 72:20; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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