J. Phys. IV France 08 (1998) Pr6-63-Pr6-67
Potential energy landscape of simple structural glassesL. Angelani1, G. Parisi2 and G. Ruocco1
1 Dipartimento di Fisica and INFM, Università di L'Aquila, Italy
2 Dipartimento di Fisica and INFN, Università La Sapienza di Roma, Italy
We numerically investigate the "topography" of the multidimensional potential energy landscape of Lennard-Jones model glasses of small size. We first determine the statistical features of local minima and saddle points, relationships betwenn them and cross-correlations among the measured quatities. From these informations we approximate the partition function of the glass restricting the sum over potential energy minima and taking into account harmonic vibrations around them. The approximation is validated by the comparison with Molecular Dynamics computation up to a temperature in the liquid phase, evidencing the reliability of simple local-vibrations/collective-jumps model in describing glass-forming systems.
© EDP Sciences 1998