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- W2797123892 abstract "We study the nature of the glass transition by cooling model atomistic glass formers at constant rate from a temperature above the onset of glassy dynamics to $T=0$. Motivated by the East model, a kinetically constrained lattice model with hierarchical relaxation, we make several predictions about the behavior of the supercooled liquid as it passes through the glass transition. We then compare those predictions to the results of our atomistic simulations. Consistent with our predictions, our results show that the relaxation time $tau$ of the material undergoes a crossover from super-Arrhenius to Arrhenius behavior at a cooling-rate-dependent glass transition temperature $T_text{g}$. The slope of $lntau$ with respect to inverse temperature exhibits a peak near $T_text{g}$ that grows more pronounced with slower cooling, matching our expectations qualitatively. Additionally, the limiting value of this slope at low temperature shows remarkable quantitative agreement with our predictions. Our results also show that the rate of short-time particle displacements deviates from the equilibrium linear scaling around $T_text{g}$, asymptotically approaching a different linear scaling. To our surprise, these short-time displacements, the dynamic indicators of the underlying excitations responsible for structural relaxation, show no spatial correlations beyond a few particle diameters, both above and below $T_text{g}$. This final result is contrary to our expectation, based on previous results for East model glasses formed by cooling, that inter-excitation correlations should emerge as the liquid vitrifies." @default.
- W2797123892 created "2018-04-24" @default.
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- W2797123892 date "2018-04-11" @default.
- W2797123892 modified "2023-10-16" @default.
- W2797123892 title "On the nature of the glass transition in atomistic models of glass formers" @default.
- W2797123892 hasPublicationYear "2018" @default.
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