Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Poster Session I

CPP 17.29: Poster

Montag, 1. April 2019, 17:30–19:30, Poster B1

How coupled elementary units determine heterogeneity in macroscopic glass-forming systems — •Lawrence Smith and Andreas Heuer — Westfälische Wilhelms-Universität, Münster, Germany

Elementary units of a binary Lennard-Jones glassformer can be identified through quantitative analysis of its underlying potential energy landscape. These units can be fully understood within the continuous time random walk formalism and are found to contain the complete information concerning thermodynamics and diffusivity, while displaying finite size effects with respect to relaxation times and spacial correlations [1].

Previous research has shown that it is possible to identify major contributions to the non-Gaussian parameter as arising from the moments of the waitingtime distribution for jumps between metabasins of the potential energy landscape [2].

We investigate the impact of a coupling between elementary units on the non-Gaussian parameter (NGP) to gain insight into mechanisms underlying the emergence of dynamic heterogeneity as measured in the NGP and four-point correlation functions in the stochastic model as well as in molecular dynamics simulations.

[1] C. Rehwald, A. Heuer, Phys. Rev. E 86, 051504 (2012)

[2] C. Schröer, A. Heuer, Phys. Rev. Lett. 110, 067801 (2013)