Publication : t04/245

Spatial structures and dynamics of kinetically constrained models of glasses

Toninelli C. (Laboratoire de Physique Théorique (LPT), Ecole Normale Supérieure (ENS), 24 rue Lhomond, F-75005 Paris, FRANCE)
Biroli G. (CEA, DSM, SPhT (Service de Physique Théorique), F-91191 Gif-sur-Yvette, FRANCE)
Fisher D.S. (Lyman Laboratory of Physics, Harvard University, Cambridge, MA 02138, USA)
Abstract:
Kob and Andersen's simple lattice models for the dynamics of structural glasses are analyzed. Although the particles have only hard core interactions, the imposed constraint that they cannot move if surrounded by too many others causes slow dynamics. On Bethe lattices a dynamical transition to a partially frozen phase occurs. In finite dimensions there exist rare mobile elements that destroy the transition. At low vacancy density, v, the spacing, $\Xi$, between mobile elements diverges exponentially or faster in 1/v. Within the mobile elements, the dynamics is intrinsically cooperative and the characteristic time scales diverges faster than any power of 1/v (although slower than $\Xi$). The tagged-particle diffusion coefficient vanishes roughly as $\Xi^{-d}$.
Année de publication : 2004
Conférence - : in: Program of the March Meeting 2004 of the American Physical Society ; Montréal, Canada ; 2004-03-22 / 2004-03-26
Langue : Anglais
NB : 49, p. 473 (2004) [Part 1]

 

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