Off equilibrium dynamics in 2d-XY system
Statistical Mechanics
2009-11-10 v1
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 determine, via Monte Carlo simulations, the time-evolution of these quantities and extract 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 violation to the equilibrium fluctuation-dissipation theorem. However, a direct measure of this ratio leads to a vanishing value.
Cite
@article{arxiv.cond-mat/0309342,
title = {Off equilibrium dynamics in 2d-XY system},
author = {Stephane Abriet and Dragi Karevski},
journal= {arXiv preprint arXiv:cond-mat/0309342},
year = {2009}
}