Dresden 2003 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 27: Growth processes and interface features II

DY 27.1: Vortrag

Dienstag, 25. März 2003, 16:45–17:00, G\"OR/229

Thermal roughening of an SOS-model with elastic interaction — •F. Gutheim, H. Müller-Krumbhaar, and E. Brener — 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.