Berlin 2018 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 68: Poster: Complex Fluids, Glasses, Granular

DY 68.18: Poster

Donnerstag, 15. März 2018, 15:30–18:00, Poster A

The non-Gaussian parameter and breakdown of the Stokes-Einstein relation in supercooled liquids — •Lawrence Smith and Andreas Heuer — Institut für physikaliusche Chemie

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].

This work investigates the impact of coupling between these elementary units on spacial heterogeneity. By analysing the non-Gaussian parameter in molecular dynamics simulations as well as in a stochastic model we gain insight into the breakdown of the Stokes-Einstein relation and into the underlying lengthscales at play.

[1] C. Rehwald, A. Heuer, Phys. Rev. E 86, 051504 2012 [1] C. Schroer, A. Heuer, Phys. Rev. Lett. 110, 067801 2013