PMID 25165938
DOI: 10.1103/PhysRevLett.110.245702
WoS: 000320282600010
101 Citations
Résumé:

We use computer simulations to investigate the static properties of a simple glass-forming fluid in which the positions of a finite fraction of the particles have been frozen. By probing the equilibrium statistics of the overlap between independent configurations of the liquid, we find strong evidence that this random pinning induces a glass transition. At low temperatures, our numerical findings are consistent with the existence of a random first-order phase transition rounded by finite size effects.

Ref HAL: hal-00823177_v1
Ref Arxiv: 1302.4868
DOI: 10.1038/nphys2592
WoS: 000318550200023
Ref. & Cit.: NASA ADS
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183 Citations
Résumé:

The glass transition, extensively studied in dense fluids, polymers, or colloids, corresponds to a dramatic evolution of equilibrium transport coefficients upon a modest change of control parameter, like temperature or pressure. A similar phenomenology is found in many systems evolving far from equilibrium, such as driven granular media, active and living matter. While many theories compete to describe the glass transition at thermal equilibrium, very little is understood far from equilibrium. Here, we solve the dynamics of a specific, yet representative, class of glass models in the presence of nonthermal driving forces and energy dissipation, and show that a dynamic arrest can take place in these nonequilibrium conditions. While the location of the transition depends on the specifics of the driving mechanisms, important features of the glassy dynamics are insensitive to details, suggesting that an 'effective' thermal dynamics generically emerges at long time scales in nonequilibrium systems close to dynamic arrest.

Commentaires: 7 pages, 2 figs Journal: Nature Phys. 9, 310 (2013)

Ref HAL: hal-00808533_v1
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Résumé:

Equilibrium study of a liquid-glass transition

Ref HAL: hal-00770499_v1
Ref Arxiv: 1209.2814
DOI: 10.1063/1.4769251
WoS: 000316969500009
Ref. & Cit.: NASA ADS
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70 Citations
Résumé:

We characterize vibrational motion occurring at low temperatures in dense suspensions of soft repulsive spheres over a broad range of volume fractions encompassing the jamming transition at (T = 0, phi = phi_J). We find that characteristic time and length scales of thermal vibrations obey critical scaling in the vicinity of the jamming transition. We show in particular that the amplitude and the time scale of dynamic fluctuations diverge symmetrically on both sides of the transition, and directly reveal a diverging correlation length. The critical region near phi_J is divided in three different regimes separated by a characteristic temperature scale T*(phi) that vanishes quadratically with the distance to phi_J. While two of them, (T < T*(phi), phi > phi_J) and (T < T*(phi), phi < phi_J), are described by harmonic theories developed in the zero temperature limit, the third one for T > T*(phi) is inherently anharmonic and displays new critical properties. We find that the quadratic scaling of T*(phi) is due to nonperturbative anharmonic contributions, its amplitude being orders of magnitude smaller than the perturbative prediction based on the expansion to quartic order in the interactions. Our results show that thermal vibrations in colloidal assemblies directly reveal the critical nature of the jamming transition. The critical region, however, is very narrow and has not yet been attained experimentally, even in recent specifically-dedicated experiments.

Commentaires: 18 pages; submitted to J. Chem. Phys. for "Special Topic Issue on the Glass Transition"

Ref HAL: hal-00808526_v1
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Résumé:

Statistical physics in the absence of thermal fluctuations

Ref HAL: hal-00808522_v1
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Résumé:

Unified study of glass and jamming rheology in soft particle systems

Ref HAL: hal-00808520_v1
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Résumé:

Active particles at large density