https://doi.org/10.1140/epjb/e2003-00110-y
Aging dynamics of ± J Edwards-Anderson spin glasses
1
Departamento de Física, Universidade Federal do Rio Grande do Sul,
CP 15051, 91501-970 Porto Alegre, Brazil
2
Facultad de Matemática, Astronomía y Física,
Universidad Nacional de Córdoba, Ciudad Universitaria, 5000 Córdoba,
Argentina
Corresponding authors: a stariolo@if.ufrgs.br - b mmontemu@ictp.trieste.it - c tamarit@famaf.unc.edu.ar
Received:
21
October
2002
Revised:
13
January
2003
Published online:
11
April
2003
We analyze by means of extensive computer simulations the out of
equilibrium dynamics of Edwards-Anderson spin glasses in d=4 and
d=6 dimensions with ± J interactions. In
particular, we focus our analysis on the scaling properties of
the two-time autocorrelation function in a wide range of temperatures from
to
in both systems.
In both the 4d and
6d models at very low temperatures we study the effects of discretization
of energy levels. Strong sub-aging
behaviors are found. We argue that
this is because in the times accessible to our simulations the systems are
only able to probe activated dynamics through the lowest discrete energy levels
and remain trapped around nearly flat regions of the energy landscape.
For temperatures
in 4d and 6d we find logarithmic scalings that are compatible
with simple dynamical ultrametricity. Nevertheless the behaviour of the systems,
even in 6d is very different from the mean field SK model results.
PACS: 75.10.Nr – Spin-glass and other random models
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003