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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Statistical Mechanics

Background:

  • Theories of the glass transition often link structural relaxation time (τ_α) to a growing static length scale (ξ).
  • This length scale is presumed to be governed by the free energy landscape, independent of local dynamic rules.

Purpose of the Study:

  • To investigate the relative contributions of static length scale growth versus local dynamics slowdown to the structural relaxation time near the glass transition.
  • To challenge the prevailing view that static length scale is the dominant factor controlling τ_α.

Main Methods:

  • Utilized particle-radius-swap dynamics simulations.
  • Analyzed the increase in structural relaxation time (τ_α) on approach to the glass transition.

Main Results:

  • Simulations indicate that the growth of a static length scale contributes only modestly to the increase in τ_α.
  • A significantly larger contribution to τ_α originates from the slowdown of local dynamics.
  • Observed strong coupling between particle diffusion and density fluctuations in real glasses.

Conclusions:

  • The glass transition is more influenced by the dynamics of local rearrangements than by the growth of static length scales.
  • Findings support the strong coupling model of diffusion and density fluctuations in glassy systems.