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Physique Statistique
(33) Production(s) de l'année 2024
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Emergence of mesoscale flows under non-equilibrium drive in crowded environments 
Auteur(s): Klamser J., Keta Y.-E., Jack Robert, Berthier L.
Conférence invité: INDO-FRENCH WORKSHOP ON CLASSICAL AND QUANTUM DYNAMICS IN OUT OF EQUILIBRIUM SYSTEMS (Bengaluru (Bangalore), IN, 2024-12-16)
Ref HAL: hal-04876412_v1
Exporter : BibTex | endNote
Résumé: The emergence of surprising collective behaviors in systems driven out of equilibrium by local energy injection at the particle level remains a central theme in the study of active matter. Recently, chaotic flows reminiscent of turbulence have garnered significant attention due to their appearance in diverse biological and physical active matter systems. In this talk, I will demonstrate how even the simplest model of active particles — self-propelled point particles — can exhibit mesoscale flows, characterized by streams and vortices, when very persistent active forces compete with crowding at high densities.In the second part, I will introduce a minimal model of non-reciprocal interactions inspired by human crowds, which generates collective flows strikingly similar to those of the self-propelled particles. Interestingly, as the system approaches the equilibrium limit by reducing non-reciprocity, it undergoes an absorbing phase transition characterized by an infinite number of absorbing states and critical exponents consistent with the conserved directed percolation universality class.
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Integration of Partial Differential Equations
Auteur(s): Guiselin B.
(Cours Master )
, 2024 - Université de Montpellier, ( FR )
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Monte Carlo methods
Auteur(s): Guiselin B.
(Cours Master )
, 2024 - Université de Montpellier, ( FR )
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Integration of Ordinary Differential Equations
Auteur(s): Guiselin B.
(Cours Master )
, 2024 - Université de Montpellier, ( FR )
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Modélisation atomistique de liquides à haute température
Auteur(s): Ispas S.
Conférence invité: Journée de prospective sur la physicochimie des liquides à haute température (Paris, FR, 2024-11-29)
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Dynamic fracture of alkali silicate glasses: insights from large scale atomistic simulations
Auteur(s): Ispas S.
Conférence invité: MechGlass2024 USTVerre Thematic Day (Paris, FR, 2024-01-12)
Ref HAL: hal-04860173_v1
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Résumé: The fracture of oxide glasses is a subject of high complexity since many factors (e.g. length scale under investigation, strain rate, chemical composition, etc...) play an important role. Using large scale molecular dynamics simulations, we have investigated the composition dependence on the fracture behaviour of sodium silicate glasses on the microscopic scales. While silica glass presents a nearly perfect brittle fracture behaviour, we have found that the one of sodium rich glasses is accompanied by the nucleation of irregular voids as large as 3-4nm ahead of the crack front, indicating the presence of nanoductility for these glasses. We have also explored the spatial and temporal changes of various atomic-level properties and the correlations between them. It has been found that these properties are spatially very heterogeneous with disorder becoming more pronounced for alkali rich compositions. Close to the crack tip, a heating of several hundred degrees above the average temperature has been identified, which permits the structure to relax.
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Exploring the atomic scale surface properties of alkali silicate glasses
Auteur(s): Zhang Z., Ispas S., Kob W.
Conférence invité: CECAM Bridging the Atomic-Mesoscale Gap for Complex Interfaces (Montpellier, FR, 2024-09-25)
Ref HAL: hal-04860165_v1
Exporter : BibTex | endNote
Résumé: Despite the many experimental, theoretical, and numerical studies, there are still many unknowns about the microscopic understanding of the surface properties of silicate glasses. Nowadays, many applications rely on the control of surface composition, local structure, or morphology. Moreover, the disordered nature of the glass structure makes exploring and rationalizing some of these properties difficult on a microscopic level. MD simulations have been carried out to systematically examine the influence of alkali content and their chemical nature on the properties of alkali glass surfaces. We have shown how the production history, whether it's a melt-quench process or dynamic fracture, has a direct impact on both the atomistic-level and morphological properties
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