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(326) Production(s) de BERTHIER L.
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Ordered and disordered motion indense active materials
Auteur(s): Berthier L.
Conférence invité: Biomimetic and living materials: active matter at high densities (Lausanne, CH, 2016-12-08)
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Yielding?
Auteur(s): Berthier L.
(Séminaires)
LPS, ENS Paris (Paris, FR), 2016-04-27 |
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Collective motion in dense active
materials
Auteur(s): Berthier L.
(Séminaires)
Gulliver, ESPCI (Paris, FR), 2016-02-08 |
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Note: Physical mechanisms for the bulk melting of stable glasses
Auteur(s): Jack Robert L., Berthier L.
(Article) Publié:
The Journal Of Chemical Physics, vol. 145 p.076101 (2016)
Texte intégral en Openaccess :
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The nonequilibrium glassy dynamics of self-propelled particles
Auteur(s): Flenner Elijah, Szamel G., Berthier L.
(Article) Publié:
Soft Matter, vol. 12 p.7136 (2016)
Texte intégral en Openaccess :
Ref HAL: hal-01382401_v1
Ref Arxiv: 1606.00641
DOI: 10.1039/C6SM01322H
WoS: 000382113400007
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
32 Citations
Résumé: We study the glassy dynamics taking place in dense assemblies of athermal active particles that are driven solely by a nonequilibrium self-propulsion mechanism. Active forces are modeled as an Ornstein-Uhlenbeck stochastic process, characterized by a persistence time and an effective temperature, and particles interact via a Lennard-Jones potential that yields well-studied glassy behavior in the Brownian limit, obtained as the persistence time vanishes. By increasing the persistence time, the system departs more strongly from thermal equilibrium and we provide a comprehensive numerical analysis of the structure and dynamics of the resulting active fluid. Finite persistence times profoundly affect the static structure of the fluid and give rise to nonequilibrium velocity correlations that are absent in thermal systems. Despite these nonequilibrium features, for any value of the persistence time we observe a nonequilibrium glass transition as the effective temperature is decreased. Surprisingly, increasing departure from thermal equilibrium is found to promote (rather than suppress) the glassy dynamics. Overall, our results suggest that with increasing persistence time, microscopic properties of the active fluid change quantitatively, but the broad features of the nonequilibrium glassy dynamics observed with decreasing the effective temperature remain qualitatively similar to those of thermal glass-formers.
Commentaires: Soft Matter 12, 7136 (2016)
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Point-to-set lengths, local structure, and glassiness
Auteur(s): Yaida Sho, Berthier L., Charbonneau Patrick, Tarjus Gilles
(Article) Publié:
Physical Review E: Statistical, Nonlinear, And Soft Matter Physics, vol. 94 p.032605 (2016)
Texte intégral en Openaccess :
Ref HAL: hal-01371450_v1
Ref Arxiv: 1511.03573
DOI: 10.1103/PhysRevE.94.032605
WoS: 000383878500004
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
16 Citations
Résumé: The growing sluggishness of glass-forming liquids is thought to be accompanied by growing structural order. The nature of such order, however, remains hotly debated. A decade ago, point-to-set (PTS) correlation lengths were proposed as measures of amorphous order in glass formers, but recent results raise doubts as to their generality. Here, we extend the definition of PTS correlations to agnostically capture any type of growing order in liquids, be it local or amorphous. This advance enables the formulation of a clear distinction between slowing down due to conventional critical ordering and that due to glassiness, and provides a unified framework to assess the relative importance of specific local order and generic amorphous order in glass formation.
Commentaires: 12 pages, 8 figures; v2: Fig.4 added, presentation improved. Data relevant to this work can be accessed at http://doi.org/10.7924/G8BG2KWP. Réf Journal: Phys. Rev. E 94, 032605 (2016)
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Macroscopic yielding in jammed solids is accompanied by a non-equilibrium first-order transition in particle trajectories
Auteur(s): Kawasaki T., Berthier L.
(Article) Publié:
Physical Review E: Statistical, Nonlinear, And Soft Matter Physics, vol. 94 p.022615 (2016)
Texte intégral en Openaccess :
Ref HAL: hal-01367384_v1
Ref Arxiv: 1507.04120
DOI: 10.1103/PhysRevE.94.022615
WoS: 000382177400007
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
44 Citations
Résumé: We use computer simulations to analyse the yielding transition during large-amplitude oscillatory shear of a simple model for soft jammed solids. Simultaneous analysis of global mechanical response and particle-scale motion demonstrates that macroscopic yielding, revealed by a smooth crossover in mechanical properties, is accompanied by a sudden change in the particle dynamics, which evolves from non-diffusive motion to irreversible diffusion as the amplitude of the shear is increased. We provide numerical evidence that this sharp change corresponds to a non-equilibrium first-order dynamic phase transition, thus establishing the existence of a well-defined microscopic dynamic signature of the yielding transition in amorphous materials in oscillatory shear.
Commentaires: 7 pages, 4 figures, Phys. Rev. E (in press). Réf Journal: Phys. Rev. E 94, 022615 (2016)
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