Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 27: Poster Session I (Methods: Scanning probe techniques; Methods: Atomic and electronic structure; Methods: Molecular simulations and statistical mechanics; Oxides and Insulators: Clean surfaces; Oxides and Insulators: Adsorption; Oxides and Insulators: Epitaxy and growth; Semiconductor substrates: Clean surfaces; Semiconductor substrates: Epitaxy and growth; Semiconductor substrates: Adsorption; Nano- optics of metallic and semiconducting nanostructures; Electronic structure; Methods: Electronic structure theory; Methods: other (experimental); Methods: other (theory); Solutions on surfaces; Epitaxial Graphene; Surface oder interface magnetism; Phase transitions; Time-resolved spectroscopies)

O 27.34: Poster

Dienstag, 24. März 2009, 18:30–21:00, P2

Coverage dependence of capture numbers in kinetic thin film growth and its impact on island size distributions — •Martin Körner, Mario Einax, and Philipp Maass — Institut für Physik, Technische Universität Ilmenau, Germany

The growth of self-organized structures in thin film metal epitaxy is governed by the nucleation kinetics in the submonolayer regime. In the theoretical description of this nucleation kinetics in terms of mean-field rate equations a long-standing problem is the determination of capture numbers, which describe the ability of clusters on the substrate surface to capture further adatoms. Using extensive Kinetic Monte Carlo simulations we present for the first time a systematic analysis of these capture numbers as functions of coverage and cluster size for both fractal and compact island shapes. This allows us to perform a quantitative check for the validity of the mean-field rate equations and to compare the island size distribution from KMC simulations with numerical results from the corresponding rate equations.