Temperature-dependent vibrational heterogeneities in harmonic glassesB. Rossi1, 2, G. Viliani1, 2, E. Duval3, L. Angelani4, 2 and W. Garber5
1 Dipartimento di Fisica, Università di Trento - 38050 Povo (Trento) Italy
2 INFM CRS-SOFT, c/o Università di Roma "La Sapienza" - 00185, Roma, Italy
3 LPCML, UMR-CNRS 5620, Université Lyon I - 69622 Villeurbanne Cedex, France
4 Dipartimento di Fisica, Università di Roma "La Sapienza" - 00185 Roma, Italy
5 Department of Applied Mathematics and Statistics, Stony Brook University Stony Brook, NY 11794-3600, USA
received 12 November 2004; accepted in final form 16 May 2005
published online 10 June 2005
Numerical simulation is employed to study dynamical heterogeneities in model monoatomic harmonic glasses, whose atoms interact trough the Lennard-Jones potential. Soft and hard vibrational heterogeneities are observed, and a temperature effect on these heterogeneities is found. A method is proposed to evaluate the size of the heterogeneities.
63.50.+x - Vibrational states in disordered systems.
61.43.-j - Disordered solids.
61.43.Fs - Glasses.
© EDP Sciences 2005