Regensburg 2016 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 31: Poster - Pattern Formation
DY 31.8: Poster
Dienstag, 8. März 2016, 18:15–21:00, Poster C
Thin film and kinetic Monte Carlo modeling of Rayleigh-Plateau instabilities of ridges on substrates — Walter Tewes1, •Oleg Buller2, Svetlana Gurevich1, Andreas Heuer2, and Uwe Thiele1 — 1Institut für Theoretische Physik, Westfälische Wilhelms-Universität Münster, 48149 Münster — 2Institut für Physikalische Chemie, Westfälische Wilhelms-Universität Münster, 48149 Münster
The Rayleigh-Plateau-like instability of ridges formed by molecules on prepatterned substrates is studied by means of Kinetic Monte Carlo (KMC) simulations and a thin film continuum model. We show systematically the qualitative agreement of the occurring instability in both models. In particular, we demonstrate that in the KMC model the transversal instability of ridges occurs on well defined scales which are significantly larger than the intrinsic scales of thermodynamical fluctuations. In the thin film model, the transversal instabilty for a single ridge and two weakly interacting ridges is investigated through a transversal linear stability analysis. We show the dispersion relations for transversal modulations and investigate their dependency on the system parameters. In regimes accessible to direct simulations, similar results are obtained for the KMC model. Finally a mapping of the two model approaches in terms of energetics and statics is discussed for the case of homogeneous substrates.