Dynamical Facilitation Governs the Equilibration Dynamics of Glasses,Physical Review X

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Dynamical Facilitation Governs the Equilibration Dynamics of Glasses
Physical Review X ( IF 11.6 ) Pub Date : 2024-07-19 , DOI: 10.1103/physrevx.14.031012
Rahul N. Chacko ₁ , François P. Landes ₂ , Giulio Biroli ₃ , Olivier Dauchot ₄ , Andrea J. Liu ₁ , David R. Reichman ₅

Affiliation

Convincing evidence of domain growth in the heating of ultrastable glasses suggests that the equilibration dynamics of supercooled liquids could be driven by a nucleation and growth mechanism. We investigate this possibility by simulating the equilibration dynamics of a model glass during both heating and cooling between poorly and well-annealed states. Though we do observe the growth of domains during heating, we find that domains are absent during cooling. This absence is inconsistent with classical nucleation theory. By comparing the equilibration dynamics of our glass with that of two models with kinetic constraints, we demonstrate that dynamical facilitation generically leads to heating driven by domain growth and cooling without domains. Our results provide strong evidence that dynamical facilitation, not nucleation and interfacial-tension-driven domain growth, is the driving mechanism for the equilibration dynamics of glass formers.

中文翻译：

动力学促进控制眼镜的平衡动力学

超稳定玻璃加热过程中域生长的令人信服的证据表明，过冷液体的平衡动力学可能是由成核和生长机制驱动的。我们通过模拟模型玻璃在不良退火状态和良好退火状态之间加热和冷却期间的平衡动力学来研究这种可能性。尽管我们确实观察到加热过程中磁域的生长，但我们发现冷却过程中磁域不存在。这种缺失与经典成核理论不一致。通过将我们的玻璃的平衡动力学与具有动力学约束的两个模型的平衡动力学进行比较，我们证明动态促进通常会导致由域生长驱动的加热和无域的冷却。我们的结果提供了强有力的证据，表明动态促进，而不是成核和界面张力驱动的域增长，是玻璃形成体平衡动力学的驱动机制。

更新日期：2024-07-19

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