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DY: Dynamik und Statistische Physik

DY 40: Wachstumsprozesse und Grenzfl
ächeneigenschaften

DY 40.2: Vortrag

Donnerstag, 14. März 2002, 10:00–10:15, H2

Morphology–transitions at vicinal Cu–surfaces — •Heike Emmerich — Max-Planck-Intsitut für Physik komplexer Systeme, Noethnitzer Strasse 38, 01187 Dresden

An extension of the Burton–Cabrera–Frank (BCF) model including diffusion along steps and entropic step–step interaction is introduced. This extended model is successfully applied to simulate recent experiments at vicinal Cu surfaces [Phys. Rev. Lett. 83, 4353 (1999)]. In particular, the rise of two qualitatively different morphologies can be explained by the competition of the four distinct driving and restoring forces of the model implying different directions for the growth of instabilities along the step edges. In addition out a linear stability analysis of the extended model is carried out. The result is a wavelength for the fastest growing mode which is larger than the one predicted by Bales and Zangwill and in agreement with the experiments.