Berlin 2005 – wissenschaftliches Programm
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DY: Dynamik und Statistische Physik
DY 34: Poster
DY 34.81: Poster
Montag, 7. März 2005, 15:30–18:00, Poster TU D
Defect-Induced Coarsening in Step Flow Growth — •Gerrit Danker1, Olivier Pierre-Louis2, Chaouqi Misbah2, and Klaus Kassner1 — 1Institut für Theoretische Physik, Otto-von-Guericke-Universität Magdeburg, PSF 4120, 39016 Magdeburg, Germany — 2LSP, UJF-Grenoble 1, BP 87, 38402 Saint Martin d’Hères, France
Epitaxial growth on vicinal surfaces is known to lead to the so-called meandering instability: steps become wavy and the crystal surface acquires ripples perpendicular to the step direction. A simple theory which presumes that steps meander in phase predicts that the ripples have a constant lateral width and that their amplitude develops asymptotically like t1/2 [1]. However, topological defects which arise early in the instability alter this scenario dramatically. We extend the theory to take phase perturbations into account and show by numerical simulations and simple arguments that the surface is subject to coarsening.
[1] F. Gillet, O. Pierre-Louis, and C. Misbah: Non-linear evolution of step meander during growth of a vicinal surface with no desorption. Eur. Phys. J. B. (2000).