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Relaxation pathway confinement in glassy dynamics.

J A Rodriguez Fris1, M A Frechero1, G A Appignanesi1

  • 1Sección Fisicoquímica, INQUISUR-UNS-CONICET, Universidad Nacional del Sur, Av. Alem 1253, 8000 Bahía Blanca, Argentina.

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Summary
This summary is machine-generated.

Researchers explored particle mobility in glass-forming systems, revealing an "entropic funnel" that restricts relaxation pathways as the system cools. This confinement is linked to decreasing mobile particles and Shannon entropy.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Statistical Mechanics

Background:

  • Glass-forming systems exhibit complex dynamics upon cooling.
  • Understanding particle mobility is crucial for characterizing glassy states.
  • Dynamic propensity quantifies local structural constraints on particle motion.

Purpose of the Study:

  • To investigate the relationship between particle mobility distributions and dynamic propensity in glass-forming systems.
  • To elucidate the nature of relaxation pathways during supercooling.
  • To characterize the concept of an
  • entropic funnel
  • in glass dynamics.

Main Methods:

  • Computation of excess particle mobility distributions.
  • Comparison with distributions of dynamic propensity.
  • Analysis of Shannon entropy changes during cooling.

Main Results:

  • Demonstrated an increasing confinement of relaxation pathways upon supercooling.
  • Identified an
  • entropic funnel
  • governing dynamical trajectories.
  • Observed decay and collapse of Shannon entropy, supporting the funnel concept.

Conclusions:

  • The dynamics of glass-forming systems are characterized by an
  • entropic funnel
  • that restricts relaxation pathways.
  • This funnel arises from a decreasing set of mobile particles and is reflected in entropy changes.
  • The findings provide insights into the fundamental mechanisms of glass relaxation.