SKM 2023 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 34: Statistical Physics: Far From Equilibrium II
DY 34.5: Vortrag
Mittwoch, 29. März 2023, 17:45–18:00, ZEU 250
Driving a first-order phase transformation by quenching the density: Unleashing hidden states — •Miriam Klopotek1, Martin Oettel2, and Hans Joachim Schöpe2 — 1University of Stuttgart, SimTech Cluster of Excellence EXC 2075, Stuttgart, Germany — 2University of Tübingen, Institute for Applied Physics, Tübingen, Germany
Abruptly increasing the number density, the primary order parameter of a many-particle system, is a basic mechanism to drive a first-order phase transition – elementary for athermal systems and thus for the solidification process from a fluid. A better-known experiment on thermal systems is quenching the temperature down to below the critical point, suddenly ‘freezing out’ the original degrees of freedom, whereafter the system densifies locally upon response. A density quench, in turn, intervenes directly and globally on the order parameter. A manifest example is thin film growth. As dynamical arrest is imminent, ‘hidden’ metastable states appear. We employ kinetic Monte Carlo simulations of a simple lattice model of sticky hard rods under quasi-2D confinement, gradually growing a full monolayer under different quench (growth) rates. The phenomenology is extremely rich: At least five distinct, non-classical phase transformation pathways are identified in this most simple model. They ‘tile’ a corresponding dynamical control diagram.