Berlin 2012 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 11: Glasses II (with CPP, talks by DY)
DY 11.1: Vortrag
Dienstag, 27. März 2012, 10:00–10:15, MA 004
The coupled energy landscape model — •Christian Rehwald and Andreas Heuer — Institut für Physikalische Chemie, Westfälische Wilhelms-Universität Münster, 48149Münster
While the dynamics of small glass-forming systems can be described by properties of the underlying potential energy landscape (PEL), this concept breaks down in large systems. Here we present the “coupled energy landscape model” (CLM) which extends the PEL description to macroscopic system by introducing a coupling mechanism between the PEL of elementary systems (ES).
First we use the distance dependence of structural relaxations after an initial reorganization in an iso-configurational ensemble of a non-equilibrium configuration. The results indicate the existence of a causal connection between successive events, which can be identified as dynamical coupling between ES.
In a next step we use different observables to extract coupling mechanisms and their strength in the CLM from MD simulations (of a binary mixture of LJ particles): Finite size effects of τα and the non-exponentiality parameter βKWW are proving to be an appropriate measure for comparing the two dynamics. The CLM combines advantages of recently discussed models for the glass transition like facilitated spin models and the mosaic approach and can be used to understand principles of glassy dynamics like increasing τα and emergence of the growing dynamical length scale χ4.