Response function of coarsening systems
Laboratoire de Physique, ENS-Lyon and CNRS, 69364, Lyon Cedex 07, France
2 Département de Physique des Matériaux, Université Claude Bernard and CNRS, 69622 Villeurbanne Cedex, France
Corresponding author: a email@example.com
Published online: 15 October 1999
The response function of domain growth processes, and in particular the violation of the fluctuation-dissipation theorem, are studied both analytically and numerically. In the asymptotic limit of large times, the fluctuation-dissipation ratio X, which quantifies this violation, tends to one if and to zero if , corresponding to the fast ("bulk" ) and slow ("domain-wall" ) responses, respectively. In this paper, we focus on the pre-asymptotic behavior of the domain-wall response. This response is shown to scale with the typical domain length L(t) as 1/L(t) for dimension d> 2, and as for d=2. Numerical results confirming this analysis are presented.
PACS: 05.70.Ln – Nonequilibrium and irreversible thermodynamics / 75.40.Gb – Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.) / 75.40.Mg – Numerical simulation studies
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999