Dresden 2003 – wissenschaftliches Programm

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O: Oberflächenphysik

O 24: Postersitzung (Epitaxie und Wachstum, Oxide und Isolatoren, Elektronische Struktur, Oberfl
ächenreaktionen, Adsorption an Oberfl
ächen, Organische Dünnschichten)

O 24.10: Poster

Mittwoch, 26. März 2003, 14:30–17:30, P1

Simulation of wetting-layer and island formation in heteroepitaxial growthh — •Florian Much and Michael Biehl — Institut für Theoretische Physik Julius-Maximilians-Universität Am Hubland, 97074 Würzburg, Germany

We investigate various phenomena of strained heteroepitaxial growth. To this end we study a model in 1+1 dimension by means of off–lattice Kinetic Monte Carlo simulations. We observe the appearance of strain induced mounds upon a wetting layer, i.e. Stranski–Krastanov growth. The transition from 2d to 3d islands occurs at a critical layer thickness and its dependence on the growth parameters is studied quantitatively. We find that for large enough deposition rates the layer thickness as well as the size and density of islands depend on the misfit between substrate and adsorbate, only.