Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 51: Glasses (joint session CPP/DY, organized by DY)
CPP 51.6: Vortrag
Donnerstag, 10. März 2016, 11:00–11:15, H48
Spatio-temporal Correlations of Glass-forming Systems in Terms of Coupled Energy Landscapes — •Carsten Schroer1,2 and Andreas Heuer1,2 — 1Westfälische Wilhelms-Universität Münster, Institut für physikalische Chemie, Corrensstraße 28/30, 48149 Münster, Germany — 2NRW Graduate School of Chemistry, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany
The concept of the potential energy landscape is an effective tool for the physical description of supercooled liquids in the vicinity of the glass-transition. In this framework, typically small elementary systems are studied for which a strong correlation between its thermodynamic state and its dynamics can be found[1]. The transfer of these insights to macroscopic systems can be achieved by regarding the larger system as a superposition of elementary systems. The observed finite-size effects of the structural relaxation time contain important information about the coupling between these subsystems[2].
In this talk we discuss the impact of this coupling mechanism on the occurrence of spatio-temporal correlations, measured by four-point correlation functions. The results obtained by our model are compared with numerical data obtained by molecular dynamics simulations. We demonstrate that this model, based on the energy landscape of the small system plus the coupling, is sufficient to describe complex behavior of glass-formers.
[1] A. Heuer, J. Phys.: Condens. Matter 20, 37 (2008).
[2] C. Rehwald and A. Heuer, Phys. Rev. E 86, 051504 (2012).