Europhys. Lett.
Volume 75, Number 5, September 2006
Page(s) 784 - 790
Section Condensed matter: structural, mechanical and thermal properties
Published online 28 July 2006
Europhys. Lett., 75 (5), pp. 784-790 (2006)
DOI: 10.1209/epl/i2006-10175-8

Are there localized saddles behind the heterogeneous dynamics of supercooled liquids?

D. Coslovich1 and G. Pastore1, 2

1  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

received 15 May 2006; accepted in final form 13 July 2006
published online 28 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.

64.70.Pf - Glass transitions.
61.20.Lc - Time-dependent properties; relaxation.
61.20.Ja - Computer simulation of liquid structure.

© EDP Sciences 2006