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(1) Presentation(s)
Lun. 16/07/2018 14:00 Grande Ourse, Bâtiment 13, Etage 1 TURCI Francesco (University of Bristol) The framework of structural-dynamical transitions in glass-forming systems Glasses and supercooled liquids are examples of frustrated systems: their characteristically slow dynamics and high viscosities are often thought as being linked to the impossibility for the constituents to satisfy local geometrical constraints at a global scale. Starting from experimental evidence in colloidal glasses, I will show that an analysis of local geometrical motifs in real space allows us to identify signatures of an emergent non-crystalline local order in an exceptionally deeply supercooled regime [1]. To understand how such emerging features affect the frustration of supercooled liquids, I will rationalise the experimental evidence with numerical models studied within the framework of large deviations of structural-dynamical observables [2]. First, I will show that an accurate measure of the fluctuations contains deep dynamical and thermodynamical information on very low temperature equilibrium states. Then, I will report the results for three distinct models of glass-formers analysed within this framework [2,3,4], for which slow dynamics corresponds to phase coexistence in an augmented dynamical space, with a non-trivial temperature dependence that allows us to reinterpret a variety of scenarios for the low-temperature behaviour of supercooled liquids in terms of amorphous-to-amorphous transitions. Pour plus d'informations, merci de contacter Coslovich D. |