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DY: Fachverband Dynamik und Statistische Physik
DY 12: Statistical Physics far from Thermal Equilibrium II
DY 12.6: Vortrag
Montag, 18. März 2024, 16:15–16:30, BH-N 334
Sharp and soft metastable transitions under driving: A study with hard rods — •Miriam Klopotek1, Martin Oettel2, and Hans Joachim Schöpe2 — 1University of Stuttgart, Stuttgart Center for Simulation Science, SimTech Cluster of Excellence EXC 2075, Stuttgart, Germany — 2University of Tübingen, Institute for Applied Physics, Tübingen, Germany
When external forces drive systems, states that are otherwise ephemeral in equilibrium can unfold. Metastability can imply a characteristic change in the dynamics for long periods and a blanketing of the whole system with new structures. The degree of (non-)stability depends on the time scale of the driving. In a model system of sticky hard rods on lattices confined to quasi-2D [1], we observe a crossover from “sharp” to “soft” metastable transitions in the evolution of order parameters. Static external potentials can “sharpen” and even potentially stabilize them thermodynamically. Their underlying nature is thus challenging to discern when observing the dynamical evolution alone. Implications include critically examining data from thin film growth experiments.
[1] M. Klopotek, H. J. Schöpe, and M. Oettel (2024), in preparation.
Keywords: thin film growth; metastability; driven systems; hard rods; external fields