Publication : t06/121

Spontaneous and induced dynamic correlations in glass-formers. II: Model calculations and comparison to numerical simulations

Berthier L. (Laboratoire des Colloïdes, Verres, et Nanomatériaux, UMR 5587 Université Montpellier II and CNRS, pl Eugène Bataillon, F-34095 Montpellier, FRANCE)
Biroli G. (CEA, DSM, SPhT (Service de Physique Théorique), F-91191 Gif-sur-Yvette, FRANCE)
Bouchaud J.-P. (CEA, IRAMIS, SPEC (Service de Physique de lEtat Condensé), F-91191 Gif-sur-Yvette, FRANCE)
Kob W. (Laboratoire des Colloïdes, Verres, et Nanomatériaux, UMR 5587 Université Montpellier II and CNRS, pl Eugène Bataillon, F-34095 Montpellier, FRANCE)
Miyazaki K. (Department of Chemistry, Columbia University 3000 Broadway, New York, NY 10027, USA)
Reichman D.R. (Department of Chemistry, Columbia University 3000 Broadway, New York, NY 10027, USA)
Abstract:
We study in detail the predictions of various theoretical approaches, in particular mode-coupling theory (MCT) and kinetically constrained models (KCMs), concerning the time, temperature, and wavevector dependence of multi-point correlation functions that quantify the strength of both induced and spontaneous dynamical fluctuations. We also discuss the precise predictions of MCT concerning the statistical ensemble and microscopic dynamics dependence of these multi-point correlation functions. These predictions are compared to simulation of model fragile and strong glass-forming liquids. Overall, MCT fares quite well in the fragile case, in particular to explain the observed crucial role of the statistical ensemble and microscopic dynamics. KCMs provide a simplified framework for understanding how these multi-point correlation functions may encode dynamic correlations in glassy materials. However, our analysis highlights important unresolved questions concerning the application of KCMs to supercooled liquids.
Année de publication : 2007
Revue : J. Chem. Phys. 126 184504 (2007)
Preprint : arXiv:cond-mat/0609658
PACS : 64.70.Pf, 05.20.Jj
Numéro Exterieur : SPEC-S06/054
Langue : Anglais

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