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DY: Fachverband Dynamik und Statistische Physik

DY 28: Statistical Physics 5 - organized by Barbara Drossel (Darmstadt), Sabine Klapp (Berlin) and Thomas Speck (Mainz)

DY 28.5: Talk

Tuesday, March 23, 2021, 15:20–15:40, DYb

Complex routes towards a fully-grown monolayer of "sticky" hard rods — •Miriam Klopotek, Hans Joachim Schöpe, and Martin Oettel — University of Tübingen, Tübingen, Germany

We study “sticky” hard rods confined to maximally one monolayer, i.e. “(2+1)D” confinement, in a basic, on-lattice model system for thin film growth with anisotropic particles at early stages [1]. We execute a large array of kinetic Monte Carlo (KMC) simulations of the nonequilibrium dynamics [2]. The physics of monolayer growth with “sticky” hard rods is extremely rich. The bounty of phenomena on metastable phases and complex phase transition kinetics we find has not been addressed before by comparable simulation or analytical models. We identify at least five different phase transition scenarios; the different dynamical regimes are traceable in the 2D plane (“map”) spanned by the reduced temperature (or attraction strength) and deposition-flux–to–diffusion ratio. The rod-length as well as simple substrate potentials further shift these regimes and alter the topology of the “map”, i.e. the set of phase transition scenarios. The specific model choice for microscopic rotational dynamics of rods is another, surprisingly important factor altering the kinetics and, therewith, the morphological evolution.

[1] G. Hlawacek and C. Teichert, J. Phys.: Condens. Matter 25 (2013), p. 143202.

[2] M. Klopotek et al., J. Chem. Phys. 146.8 (2017), p. 084903.