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Fluctuations and noise in time-resolved light scattering experiments: measuring temporally heterogeneous dynamics

Abstract : We use Time Resolved Correlation (TRC), a recently introduced light scattering method, to study the dynamics of a variety of jammed, or glassy, soft materials. The output of a TRC experiment is cI(t,τ), the time series of the degree of correlation between the speckle patterns generated by the light scattered at time t and t+τ. We characterize the fluctuations of cI by calculating their Probability Density Function, their variance as a function of the lag τ, and their time autocorrelation function. The comparison between these quantities for a Brownian sample and for jammed materials indicate unambiguously that the slow dynamics measured in soft glasses is temporally heterogeneous. The analogies with recent experimental, numerical and theoretical work on temporal heterogeneity in the glassy dynamics are briefly discussed.
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https://hal.inrae.fr/hal-02683072
Déposant : Migration Prodinra <>
Soumis le : lundi 1 juin 2020 - 02:18:26
Dernière modification le : mercredi 14 octobre 2020 - 04:14:15

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Agnès Duri, P. Ballesta, Luca Cipelletti, H Bissig, V. Trappe. Fluctuations and noise in time-resolved light scattering experiments: measuring temporally heterogeneous dynamics. Fluctuation and Noise Letters, World Scientific Publishing, 2005, 05 (01), pp.L1-L15. ⟨10.1142/S0219477505002367⟩. ⟨hal-02683072⟩

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