Abstract
The properties of template-directed nucleation are studied close to the transition where full nucleation control is lost and additional nucleation occurs beyond the pre-patterned regions. First, kinetic Monte Carlo simulations are performed to obtain information on a microscopic level. Here the experimentally relevant cases of one-dimensional stripe patterns and two-dimensional square lattice symmetry are considered. The nucleation properties in the transition region depend in a complex way on the parameters of the system, i.e., the flux, the surface diffusion constant, the geometric properties of the pattern, and the desorption rate. Second, the properties of the stationary concentration field in the fully controlled case are studied to derive the remaining nucleation probability and thus to characterize the loss of nucleation control. Using the analytically accessible solution of a model system with purely radial symmetry, some of the observed properties can be rationalized. A detailed comparison to the Monte Carlo data is included.
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