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The one-dimensional Lennard-Jones system: collective fluctuations and breakdown of hydrodynamics (Articolo in rivista)

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The one-dimensional Lennard-Jones system: collective fluctuations and breakdown of hydrodynamics (Articolo in rivista) (literal)

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Politi A., Lepri S., Sandri P. (2005)
The one-dimensional Lennard-Jones system: collective fluctuations and breakdown of hydrodynamics
in The European physical journal. B, Condensed matter physics (Print)
(literal)

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Istituto dei Sistemi Complessi e Istituto Nazionale di Ottica Applicata, Consiglio Nazionale delle Ricerche, L.go E. Fermi 6, 50125 Firenze, Italy (literal)

Titolo

The one-dimensional Lennard-Jones system: collective fluctuations and breakdown of hydrodynamics (literal)

Abstract

The dynamical correlations of a model consisting of particles constrained on the line and interacting with a nearest-neighbour Lennard-Jones potential are computed by molecular-dynamics simulations. A drastic qualitative change of the spectral shape, from a phonon-like to a diffusive form, is observed upon reducing the particle density even ad moderate temperatures. The latter scenario is due to the spontaneous fragmentation of the crystal-like structure into an ensemble of clusters colliding among themselves. In both cases, the spectral linewidths do not follow the usual q2 behaviour for small wavenumbers q, thus signalling a breakdown of linearized hydrodynamics. This anomaly is traced back by the presence of correlations due to the reduced dimensionality. (literal)

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