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Off equilibrium dynamics in the 2d-XY system

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  • S. Abriet
  • D. Karevski

Abstract

We study the non-equilibrium time evolution of the classical XY spin model in two dimensions. The two-time autocorrelation and linear response functions are considered for systems initially prepared in a high temperature state and in a completely ordered state. After a quench into the critical phase, we use Monte Carlo simulations to determine the time-evolution of these quantities, and we deduce the temperature dependence of the slope of the parametric plot susceptibility/correlation in the asymptotic regime. This slope is usually identified with the infinite fluctuation-dissipation ratio, which measures the extent of violation of the equilibrium fluctuation-dissipation theorem. However, a direct measure of this ratio leads to a vanishing value. Copyright EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2004

Suggested Citation

  • S. Abriet & D. Karevski, 2004. "Off equilibrium dynamics in the 2d-XY system," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 37(1), pages 47-53, January.
  • Handle: RePEc:spr:eurphb:v:37:y:2004:i:1:p:47-53:10.1140/epjb/e2004-00029-9
    DOI: 10.1140/epjb/e2004-00029-9
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