Aggregation mechanisms in the adsorption of metals on Si ( 111 ) 7 × 7
2003; American Physical Society; Volume: 67; Issue: 23 Linguagem: Inglês
10.1103/physrevb.67.235412
ISSN1095-3795
AutoresE. Vasco, C. Polop, Enrique Fernández Rodríguez,
Tópico(s)Theoretical and Computational Physics
ResumoSeveral mechanisms have been revised to explain the aggregation of metal adsorbates on a $7\ifmmode\times\else\texttimes\fi{}7$ reconstructed Si(111) surface. Some of them are based on the high mobility of incident particles, while others collect the nonlocal weak or moderate interactions among adsorbates. The adsorbate aggregation, which has been characterized via the temporal evolution of the surface occupation and monomer to cluster density ratios, has been studied for each mechanism through kinetic Monte Carlo simulations as well as by approaches to the corresponding rate equations. The cooperative diffusion is revealed as the unique mechanism that is able to fit fairly the existing data related to the adsorption of metals on the $\mathrm{Si}(111)7\ifmmode\times\else\texttimes\fi{}7$ surface.
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