Spin-glass--like aging in colloidal and granular glasses
arXiv:1803.05031 · doi:10.1039/C8SM00859K
Abstract
Motivated by the mean field prediction of a Gardner phase transition between a "normal glass" and a "marginally stable glass", we investigate the off-equilibrium dynamics of three-dimensional polydisperse hard spheres, used as a model for colloidal or granular glasses. Deep inside the glass phase, we find that a sharp crossover pressure separates two distinct dynamical regimes. For pressure , the glass behaves as a normal solid, displaying fast dynamics that quickly equilibrates within the glass free energy basin. For , instead, the dynamics becomes strongly anomalous, displaying very large equilibration time scales, aging, and a constantly increasing dynamical susceptibility. The crossover at is strongly reminiscent of the one observed in three-dimensional spin-glasses in an external field, suggesting that the two systems could be in the same universality class, consistently with theoretical expectations.
arXiv comment13 pages, 12 figures (two figures added and one extra Appendix section)
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