A simulation study of energy transport in the Hamiltonian XY model (Articolo in rivista)

Type
Label
  • A simulation study of energy transport in the Hamiltonian XY model (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Alternative label
  • Delfini L.; Lepri S.; Livi R. (2005)
    A simulation study of energy transport in the Hamiltonian XY model
    in Journal of statistical mechanics
    (literal)
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  • Delfini L.; Lepri S.; Livi R. (literal)
Rivista
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  • May. (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1) Istituto Nazionale di Ottica Applicata and Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, Sezione Territoriale di Firenze, largo E Fermi 6 I-50125 Firenze, Italy 2) Dipartimento di Fisica, Università di Firenze, Sezione INFN, Unitá INFM and CSDC Firenze, via G Sansone 1 I-50019, Sesto Fiorentino, Italy (literal)
Titolo
  • A simulation study of energy transport in the Hamiltonian XY model (literal)
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. (literal)
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