Dresden 2006 – wissenschaftliches Programm
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DY: Dynamik und Statistische Physik
DY 46: Poster
DY 46.102: Poster
Donnerstag, 30. März 2006, 16:00–18:00, P1
Simulation of heteroepitaxial growth and misfit dislocations — •Markus Walther1, Michael Biehl2, Florian Much1, and Christian Vey1 — 1Institut für Theoretische Physik und Astrophysik, Sonderforschungsbereich 410, Universität Würzburg, Am Hubland, D-97074 Würzburg — 2Institute for Mathematics and Computing Science, University of Groningen, P.O. Box 800, NL-9700 AV Groningen
The atomistic simulation of strain effects in heteroepitaxial systems requires the development of off-lattice models which allow for continuous positions of the particles. We present the results of Kinetic Monte Carlo simulations of heteroepitaxial growth where the particle interactions are described by simple pair-potentials, e.g. Lennard-Jones potential in (1+1) dimensions. The lattice spacing of adsorbate materials differs from that of the substrate. The misfit induces compressive or tensile strain in the initial pseudomorphic film, resulting in the appearance of misfit dislocations in thick films and for large misfits that also affect the subsequent growth. For small misfits the adsorbate aggregates in three dimensional structures upon a pseudomorphic wetting layer in the so-called Stranski Krastanov growth mode.