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Updated: Jul 2, 2025
09:32
Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films
Published on: January 26, 2016
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Collective Relaxation Dynamics in a Three-Dimensional Lattice Glass Model
Yoshihiko Nishikawa1, Ludovic Berthier2,3
1Graduate School of Information Sciences, Tohoku University, Sendai 980-8579, Japan.
Physical Review Letters
|February 23, 2024
Summary
We numerically study glass relaxation dynamics, revealing mobile clusters act as defects that drive heterogeneous dynamics. These findings link microscopic mechanisms to thermodynamic fluctuations in glass formers.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Statistical Mechanics
Background:
- Understanding glass relaxation dynamics is crucial for materials science.
- Glasses exhibit complex behaviors near thermodynamic transitions.
- Microscopic mechanisms of relaxation remain a key research area.
Purpose of the Study:
- To numerically elucidate microscopic mechanisms controlling relaxation dynamics in a 3D lattice glass model.
- To investigate the role of low-energy barriers and mobile clusters in glass relaxation.
- To connect system dynamics to thermodynamic fluctuations near a random first-order transition.
Main Methods:
- Numerical simulations of a three-dimensional lattice glass model.
- Analysis of particle dynamics and energy barriers.
- Comparison with theoretical models and atomistic simulations.
Main Results:
- Identified a small population of particles with low-energy barriers forming mobile clusters at low temperatures.
- These mobile clusters act as facilitating defects, driving spatially heterogeneous dynamics.
- Characteristic length scales of heterogeneity are strongly coupled to thermodynamic fluctuations.
Conclusions:
- The study elucidates microscopic mechanisms of relaxation in a 3D lattice glass model.
- Mobile clusters and facilitating defects are key to heterogeneous dynamics.
- Findings provide insights into glass behavior near random first-order transitions.
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