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Article Dans Une Revue Physical Review Letters Année : 2022

Local Dynamical Heterogeneity in Simple Glass Formers

Résumé

We study the local dynamical fluctuations in glass-forming models of particles embedded in d-dimensional space, in the mean-field limit of d→∞. Our analytical calculation reveals that single-particle observables, such as squared particle displacements, display divergent fluctuations around the dynamical (or mode-coupling) transition, due to the emergence of nontrivial correlations between displacements along different directions. This effect notably gives rise to a divergent non-Gaussian parameter, α2. The d→∞ local dynamics therefore becomes quite rich upon approaching the glass transition. The finite-d remnant of this phenomenon further provides a long sought-after, first-principle explanation for the growth of α2 around the glass transition that is not based on multiparticle correlations.

Dates et versions

hal-03652651 , version 1 (26-04-2022)

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Giulio Biroli, Patrick Charbonneau, Giampaolo Folena, Yi Hu, Francesco Zamponi. Local Dynamical Heterogeneity in Simple Glass Formers. Physical Review Letters, 2022, 128 (17), pp.175501. ⟨10.1103/PhysRevLett.128.175501⟩. ⟨hal-03652651⟩
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