Berlin 2018 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 53: Complex Fluids and Soft Matter (joint session DY/ CPP / BP)

DY 53.5: Talk

Wednesday, March 14, 2018, 16:30–16:45, BH-N 334

Binary mixture thin film growth: A simulation study — •Eelco Empting, Miriam Klopotek, and Martin Oettel — Universiy of Tuebingen, Germany

We consider a binary lattice model for growth of demixing thin films. In addition to hard-core repulsion, the particles interact via attraction with their nearest neighbors, the strength of which depends on whether particles are of the like species. This system is a generalization of the regular solution theory model and can exhibit demixing and gas-liquid coexistence.

We present a spinodal decomposition diagram, which was obtained by mean-field calculations. We compare kinetic Monte Carlo simulations with expectations from this diagram. In general, deposition into spinodal regions of the phase diagram leads to demixing. With specific microscopic kinetics it is possible to arrest this demixing process. This leads to effects such as (i) kinetically limited demixing close to the surface and (ii) templated growth (repetition of the surface layer).