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Spin-glass-like aging in colloidal and granular glasses
Beatriz Seoane1, Francesco Zamponi
1Laboratoire de physique théorique, Département de physique de l'ENS, École normale supérieure, PSL Research University, Sorbonne Universités, CNRS, 75005 Paris, France.
Soft Matter
|June 13, 2018
Summary
Researchers studied glass dynamics in hard spheres, finding a crossover pressure (PG) separating normal solid-like behavior from anomalous dynamics. This suggests a connection between glassy systems and spin-glasses.
Area of Science:
- Condensed Matter Physics
- Statistical Mechanics
Background:
- The Gardner transition predicts a phase change from normal to marginally stable glasses.
- Understanding off-equilibrium dynamics is crucial for glassy materials like colloids and granular systems.
Purpose of the Study:
- Investigate the off-equilibrium dynamics of 3D polydisperse hard spheres.
- Identify dynamical regimes and phase transitions within the glass phase.
- Compare findings to theoretical predictions and spin-glass systems.
Main Methods:
- Simulations of three-dimensional polydisperse hard spheres.
- Analysis of off-equilibrium dynamics under varying pressure.
- Identification of dynamical crossovers and characteristic timescales.
Main Results:
- A sharp crossover pressure (PG) was identified, dividing glass dynamics into two regimes.
- Below PG, glasses exhibit fast dynamics and equilibrate quickly.
- Above PG, dynamics become anomalous with long equilibration times and aging.
Conclusions:
- The observed crossover is analogous to transitions in 3D spin-glasses.
- The findings support the theoretical universality class for these systems.
- Hard sphere glasses exhibit distinct dynamical behaviors dependent on pressure.
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