Volume 75, Number 5, September 2006
|Page(s)||784 - 790|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||28 July 2006|
Are there localized saddles behind the heterogeneous dynamics of supercooled liquids?
Dipartimento di Fisica Teorica, Università di Trieste - Strada Costiera 11 34100 Trieste, Italy
2 CNR-INFM Democritos National Simulation Center - Via Beirut 2-4 34014 Trieste, Italy
Accepted: 13 July 2006
We numerically study the interplay between heterogeneous dynamics and properties of negatively curved regions of the potential energy surface in a model glassy system. We find that the unstable modes of saddles and quasi-saddles undergo a localization transition close to the Mode-Coupling critical temperature. We also find evidence of a positive spatial correlation between clusters of particles having large displacements in the unstable modes and dynamical heterogeneities.
PACS: 64.70.Pf – Glass transitions / 61.20.Lc – Time-dependent properties; relaxation / 61.20.Ja – Computer simulation of liquid structure
© EDP Sciences, 2006
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