Berlin 2008 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 29: Poster II
DY 29.68: Poster
Donnerstag, 28. Februar 2008, 16:00–18:00, Poster C
Coupling effects to describe macroscopic glass-forming systems — •Christian Rehwald and Andreas Heuer — Institut für Physikalische Chemie, Westfälische Wilhelms-Universität, 48149 Münster
Studying the potential energy landscape of different small glass-forming systems with periodic boundary conditions common features can be identified, giving rise to the notion of ideal Gaussian glass formers [1]. In agreement with the experiment this model system displays deviations from the Stokes-Einstein relation which are, however, too large. We introduce a model of interacting elementary subsystems of ideal Gaussian glass formers to reproduce macroscopic glass-formers. The interaction reduce the long tails of the waiting time distribution and renders the relaxation function S0(t) less non-exponential. In particular, now the violation of the Stokes-Einstein relation is close to experimental observations. Furthermore we check the model with respect to finite size effects, extract some information about four point correlation functions and discuss the relation to facilitated spin models [2].
[1] A. Heuer, submitted to J. Phys.: Cond. Mat. (2007)
[2] Y. Jung, J. Garrahan, D. Chandler, Phys. Rev. E 69 (2004)