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Spin-glass-like aging in colloidal and granular glasses

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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 PG separates two distinct dynamical regimes. For pressure P < PG, the glass behaves as a normal solid, displaying fast dynamics that quickly equilibrate within the glass free energy basin. For P > PG, instead, the dynamics become strongly anomalous, displaying very large equilibration timescales, aging, and a constantly increasing dynamical susceptibility. The crossover at PG 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, consistent with theoretical expectations.

Graphical abstract: Spin-glass-like aging in colloidal and granular glasses

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Publication details

The article was received on 26 Apr 2018, accepted on 28 May 2018 and first published on 30 May 2018


Article type: Paper
DOI: 10.1039/C8SM00859K
Citation: Soft Matter, 2018, Advance Article
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    Spin-glass-like aging in colloidal and granular glasses

    B. Seoane and F. Zamponi, Soft Matter, 2018, Advance Article , DOI: 10.1039/C8SM00859K

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