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(326) Production(s) de BERTHIER L.
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Spontaneous and induced dynamic correlations in glass formers. II. Model calculations and comparison to numerical simulations
Auteur(s): Berthier L., Biroli G., Bouchaud J.P., Kob W., Miyazaki K., Reichman D.R.
(Article) Publié:
The Journal Of Chemical Physics, vol. 126 p.184504 (2007)
Résumé: 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 wave vector dependence of multipoint 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 multipoint correlation functions. These predictions are compared to simulations of model fragile and strong glass-forming liquids. Overall, MCT fares quite well in the fragile case, in particular, explaining the observed crucial role of the statistical ensemble and microscopic dynamics, while MCT predictions do not seem to hold in the strong case. KCMs provide a simplified framework for understanding how these multipoint correlation functions may encode dynamic correlations in glassy materials. However, our analysis highlights important unresolved questions concerning the application of KCMs to supercooled liquids. (C) 2007 American Institute of Physics.
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Revisiting the slow dynamics of a silica melt using Monte Carlo simulations
Auteur(s): Berthier L.
(Article) Publié:
Physical Review E: Statistical, Nonlinear, And Soft Matter Physics, vol. 76 p.011507 (2007)
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Efficient measurement of linear susceptibilities in molecular simulations: Application to aging supercooled liquids
Auteur(s): Berthier L.
(Article) Publié:
Physical Review Letters, vol. 98 p.220601 (2007)
Résumé: We propose a novel method to measure time-dependent linear susceptibilities in molecular simulations, which does not require the use of nonequilibrium simulations, subtraction techniques, or fluctuation-dissipation theorems. The main idea is an exact reformulation of linearly perturbed quantities in terms of observables accessible in a single unperturbed trajectory. We apply these ideas to supercooled liquids in a nonequilibrium aging regime. We show that previous work had underestimated deviations from fluctuation-dissipation relations in the case of a Lennard-Jones system, while our results for silica are in qualitative disagreement with earlier results.
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Dynamic heterogeneity in glassy materials
Auteur(s): Berthier L.
Conference: Gordon research conference Physics and chemistry of liquids (NH, US, FR, 2007-07-29)
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Dynamic heterogeneity in glassy materials
Auteur(s): Berthier L.
Conference: Mechanical behaviour of glassy materials (Vancouver, canadian, FR, 2007-07-21)
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The glass transition of soft particles
Auteur(s): Berthier L.
(Séminaires)
University of Chicago (Chicago, United States of America, FR), 2007-08-15 |
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Dynamic heterogeneity in glassy materials
Auteur(s): Berthier L.
(Séminaires)
University of Chicago (Chicago, United States of America, FR), 2007-04-15 |