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(326) Production(s) de BERTHIER L.
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Microscopic signatures of dynamic criticality close to a non-equilibrium phase transition
Auteur(s): Berthier L.
Conference: Congrés général de SFP (Paris, FR, 2009-07-06)
Résumé: Résumé (à fournir)
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Equilibrium and nonequilibrium gels
Auteur(s): Berthier L.
(Séminaires)
Theory of soft and biological matter Group (Oxford, GB), 2009-02-18 |
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Compressing random assemblies of spheres in and out of equilibrium
Auteur(s): Berthier L.
(Séminaires)
Department of Theoretical Physics (Oxford, GB), 2009-02-19
Résumé: Compressing random assemblies of spheres in and out of equilibrium
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Qu'est ce que le viellissement pour un physicien ? 
Auteur(s): Berthier L.
Conférence invité: Journee de l'IXXI sur le vieillissement (, FR, 2009-10-22)
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Compressing random assemblies of spheres in and out of equilibrium
Auteur(s): Berthier L.
Conférence invité: Topology, Structure, and Dynamics in Non-Crystalline Solids (, FR, 2009-09-20)
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The glass transition of dense fluids of hard and compressible spheres
Auteur(s): Berthier L., Witten Thomas A.
(Article) Publié:
Physical Review E: Statistical, Nonlinear, And Soft Matter Physics, vol. 80 p.021502 (2009)
Texte intégral en Openaccess : 
Ref HAL: hal-00522294_v1
PMID 19792128
Ref Arxiv: 0903.1934
DOI: 10.1103/PhysRevE.80.021502
WoS: 000269637800068
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
170 Citations
Résumé: We use computer simulations to study the glass transition of dense fluids made of polydisperse, repulsive spheres. For hard particles, we vary the volume fraction, phi, and use compressible particles to explore finite temperatures, T>0. In the hard sphere limit, our dynamic data show evidence of an avoided mode-coupling singularity near phi_{MCT} ~ 0.592, they are consistent with a divergence of equilibrium relaxation times occurring at phi_0 ~ 0.635, but they leave open the existence of a finite temperature singularity for compressible spheres at volume fraction phi > phi_0. Using direct measurements and a new scaling procedure, we estimate the equilibrium equation of state for the hard sphere metastable fluid up to phi_0, where pressure remains finite, suggesting that phi_0 corresponds to an ideal glass transition. We use non-equilibrium protocols to explore glassy states above phi_0 and establish the existence of multiple equations of state for the unequilibrated glass of hard spheres, all diverging at different densities in the range phi \in [0.642, 0.664]. Glassiness thus results in the existence of a continuum of densities where jamming transitions can occur.
Commentaires: 16 pages; 7 figures Journal: Phys. Rev. E 80, 021502 (2009)
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Nonperturbative effect of attractive forces in viscous liquids
Auteur(s): Berthier L., Tarjus Gilles
(Article) Publié:
Physical Review Letters, vol. 103 p.170601 (2009)
Texte intégral en Openaccess :
Ref HAL: hal-00522293_v1
PMID 19905741
Ref Arxiv: 0907.2343
DOI: 10.1103/PhysRevLett.103.170601
WoS: 000271164500009
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
131 Citations
Résumé: We study the role of the attractive intermolecular forces in the viscous regime of a simple glass-forming liquid by using computer simulations. To this end, we compare the structure and the dynamics of a standard Lennard-Jones glass-forming liquid model with and without the attractive tail of the interaction potentials. The viscous slowing down of the two systems are found to be quantitatively and qualitatively different over a broad density range, whereas the static pair correlations remain close. The common assumption that the behaviour of dense nonassociated liquids is determined by the short-ranged repulsive part of the intermolecular potentials dramatically breaks down for the relaxation in the viscous liquid regime.
Commentaires: 4 pages, 3 figures Journal: Phys. Rev. Lett. 103, 170601 (2009)
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