Regensburg 2004 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 25: Growth and Roughness

DY 25.4: Vortrag

Dienstag, 9. März 2004, 15:45–16:00, H3

Thermal Roughening of an SOS-Model with Elastic Interaction — •C. Pütter, F. Gutheim, and H. Müller-Krumbhaar — Institut für Festkörperforschung, Forschungszentrum Jülich, D-52425 Jülich

We analyze the effects of a long-ranged step-step interaction on thermal roughening of a crystal surface within the framework of a SOS (solid-on-solid) model by means of Monte Carlo simulation. A repulsive step-step interaction is modeled by elastic dipoles located on sites adjacent to the steps. The interaction energy based on long-ranged potentials is calculated by a multi-grid scheme. In comparison with results for short-range interactions the roughening temperature increases drastically as a consequence of anti-correlations between surface defects. In order to investigate the kinetics of crystal growth, a driving force has been included in the model. We present our analytical and numerical results.