A simulation study of energy transport in the Hamiltonian XY model
Anno: 2005
Autori: Delfini L., Lepri S., Livi R.
Affiliazione autori: CNR – Istituto Nazionale di Ottica Applicata, Largo E. Fermi 6, 50125 Firenze Italy;
CNR – Istituto dei Sistemi Complessi, Sez. Territoriale di Firenze, Largo E Fermi 6, 50125 Firenze, Italy;
Dipartimento di Fisica, Università di Firenze, and CSDC Firenze, via G Sansone 1 I-50019, Sesto Fiorentino, Italy;
Sezione INFN, Unità INFM Firenze, Italy
Abstract: The transport properties of the planar rotator model on a square lattice are analysed by means of microcanonical and non-equilibrium simulations. Well below the Kosterlitz–Thouless–Berezinskii transition temperature, both approaches consistently indicate that the energy current autocorrelation displays a long-time tail decaying as t−1. This yields a thermal conductivity coefficient which diverges logarithmically with the lattice size. Conversely, conductivity is found to be finite in the high-temperature disordered phase. Simulations close to the transition temperature are instead limited by slow convergence that is presumably due to the slow kinetics of vortex pairs.
Giornale/Rivista: JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
Volume: 2005 Da Pagina: P05006-1 A: P05006-13
Parole chiavi: transport processes; heat transfer (theory); DOI: 10.1088/1742-5468/2005/05/P05006Citazioni: 13dati 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