Studies of thermal conductivity in Fermi-Pasta-Ulam-like lattices
Anno: 2005
Autori: Lepri S., Livi R., Politi A.
Affiliazione autori: Istituto Nazionale di Ottica Applicata, Largo E. Fermi 6, 50125 Firenze, Italy;
Istituto dei Sistemi Complessi CNR, Sez. Territoriale di Firenze, Largo E. Fermi 6, 50125 Firenze, Italy;
Dipartimento di Fisica, Via G. Sansone 1, 50019, Sesto Fiorentino (FI), Italy;
Istitituto Nazionale per la Fisica della Materia, UdR Firenze, Via G. Sansone 1, 50019, Sesto Fiorentino (FI), Italy
Abstract: The pioneering computer simulations of the energy relaxation mechanisms performed by Fermi, Pasta, and Ulam (FPU) can be considered as the first attempt of understanding energy relaxation and thus heat conduction in lattices of nonlinear oscillators. In this paper we describe the most recent achievements about the divergence of heat conductivity with the system size in one-dimensional (1D) and two-dimensional FPU-like lattices. The anomalous behavior is particularly evident at low energies, where it is enhanced by the quasiharmonic character of the lattice dynamics. Remarkably, anomalies persist also in the strongly chaotic region where long-time tails develop in the current autocorrelation
function. A modal analysis of the 1D case is also presented in order to gain further insight about the role played by boundary conditions.
Giornale/Rivista: CHAOS
Volume: 15 (1) Da Pagina: 015118-1 A: 015118-9
Parole chiavi: ONE-DIMENSIONAL LATTICES; HEAT-CONDUCTION; ENERGY-TRANSPORT; RELAXATION; SYSTEMSDOI: 10.1063/1.1854281Citazioni: 55dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-05-12Riferimenti 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