Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2002-07-02
Phys. Rev. E 66, 031205 (2002)
Physics
Condensed Matter
Disordered Systems and Neural Networks
7 pages, 7 .eps figs. To appear in Phys. Rev. E
Scientific paper
10.1103/PhysRevE.66.031205
We report a molecular dynamics (MD) study of the collective dynamics of a simple monatomic liquid -interacting through a two body potential that mimics that of lithium- across the liquid-glass transition. In the glassy phase we find evidences of a fast relaxation process similar to that recently found in Lennard-Jones glasses. The origin of this process is ascribed to the topological disorder, i.e. to the dephasing of the different momentum $Q$ Fourier components of the actual normal modes of vibration of the disordered structure. More important, we find that the fast relaxation persists in the liquid phase with almost no temperature dependence of its characteristic parameters (strength and relaxation time). We conclude, therefore, that in the liquid phase well above the melting point, at variance with the usual assumption of {\it un-correlated} binary collisions, the short time particles motion is strongly {\it correlated} and can be described via a normal mode expansion of the atomic dynamics.
Ruocco Giancarlo
Scopigno Tullio
Sette Francesco
Viliani Gabriele
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