The one-dimensional Lennard-Jones system: collective fluctuations and breakdown of hydrodynamics
Anno: 2005
Autori: Politi A., Lepri S., Sandri P.
Affiliazione autori: Istituto dei Sistemi Complessi e Istituto Nazionale di Ottica Applicata, Consiglio Nazionale delle Ricerche, Largo E. Fermi 6, 50125 Firenze, Italy
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 q(2) 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.
Giornale/Rivista: EUROPEAN PHYSICAL JOURNAL B
Volume: 47 (4) Da Pagina: 549 A: 555
Parole chiavi: Single-file Diffusion; Mode-coupling Theory; Molecular-dynamics; Thermal-conductivity; Heat-conduction; Fluids; Chain; Fracture; LatticesDOI: 10.1140/epjb/e2005-00360-7Citazioni: 24dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2025-05-18Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui
