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Collective Relaxation Dynamics in a Three-Dimensional Lattice Glass Model.

Yoshihiko Nishikawa1, Ludovic Berthier2,3

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|February 23, 2024
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Summary
This summary is machine-generated.

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.

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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.