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(44) Production(s) de PITARD E.
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Thermodynamics of histories for kinetically constrained models
Auteur(s): Lecomte Vivien, Appert-rolland Cécile, Pitard E., Van duijvendijk K., Van wijland F., Garrahan J.p., Lack R.l., Chandler David
Conference: Rencontre GDR PHENIX (Paris, FR, 2006)
Texte intégral en Openaccess : 
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Thermodynamics of histories for kinetically constrained models
Auteur(s): Pitard E.
(Séminaires)
CNRS - CPT (Marseille, France, FR), 2006-00-00 |
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Self-assembled systems decorated by amphiphilic copolymers
Auteur(s): Appell Jacqueline, Ligoure C., Massiera G., Pitard E., Porte Grégoire, Ramos L.
(Affiches/Poster)
Comité d'Evaluation du LCVN (Montpellier, France, FR), 2006-02-23 |
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Finite-size effects and intermittency in a simple aging system 
Auteur(s): Pitard E.
(Article) Publié:
Physical Review E: Statistical, Nonlinear, And Soft Matter Physics, vol. 71 p.041504 (2005)
Texte intégral en Openaccess : 
Ref HAL: hal-00133156_v1
Ref Arxiv: cond-mat/0409323
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
Résumé: We study the intermittent dynamics and the fluctuations of the dynamic correlation function of a simple aging system. Given its size $L$ and its coherence length $\xi$, the system can be divided into $N$ independent subsystems, where $N=(\frac{L}{\xi})^d$, and $d$ is the dimension of space. Each of them is considered as an aging subsystem which evolves according to an activated dynamics between energy levels. We compute analytically the distribution of trapping times for the global system, which can take power-law, stretched-exponential or exponential forms according to the values of $N$ and the regime of times considered. An effective number of subsystems at age $t_w$, $N_{eff}(t_w)$, can be defined, which decreases as $t_w$ increases, as well as an effective coherence length, $\xi(t_w) \sim t_w^{(1-\mu)/d}$, where $\mu <1$ characterizes the trapping times distribution of a single subsystem. We also compute the probability distribution functions of the time intervals between large decorrelations, which exhibit different power-law behaviours as $t_w$ increases (or $N$ decreases), and which should be accessible experimentally. Finally, we calculate the probability distribution function of the two-time correlator. We show that in a phenomenological approach, where $N$ is replaced by the effective number of subsystems $N_{eff}(t_w)$, the same qualitative behaviour as in experiments and simulations of several glassy systems can be obtained.
Commentaires: 15 pages, 6 figures, published version
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Spatial correlations in the relaxation of the Kob-Andersen model
Auteur(s): Marinari Enzo, Pitard E.
(Article) Publié:
Europhysics Letters (Epl), vol. 69 p.235-241 (2005)
Texte intégral en Openaccess :
Ref HAL: hal-00364951_v1
Ref Arxiv: cond-mat/0404214
DOI: 10.1209/epl/i2004-10323-2
WoS: 000227035700014
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
17 Citations
Résumé: We describe spatio-temporal correlations and heterogeneities in a kineticallyconstrained glassy model, the Kob-Andersen model. The kinetic constraints ofthe model alone induce the existence of dynamic correlation lengths, thatincrease as the density $\rho$ increases, in a way compatible with adouble-exponential law. We characterize in detail the trapping time correlationlength, the cooperativity length, and the distribution of persistent clustersof particles. This last quantity is related to the typical size of blockedclusters that slow down the dynamics for a given density.
Commentaires: 7 pages, 6 figures, published version (title has changed)
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Intermittent Dynamics and fluctuations in a simple aging
Auteur(s): Pitard E.
Conference: Wokshop on Dynamical arrest of soft Matter and Colloids (MCRTN on Arrested Matter (Bad Gastein, Austria, FR, 2005-01-24)
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Spatio-temporal heterogeneities in the relaxation of simple glassy model systems and in experiments
Auteur(s): Pitard E.
Conference: Stat. Phys. 22 (Bangalore, India, FR, 2004-07-04)
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