INVESTIGADORES
TAMARIT Francisco
artículos
Título:
Non-equilibrium structures and slow dynamics in a two dimensional
Autor/es:
O. OSENDA; F. TAMARIT; S. CANNAS
Revista:
PHYSICAL REVIEW E - STATISTICAL PHYSICS, PLASMAS, FLUIDS AND RELATED INTERDISCIPLINARY TOPICS
Editorial:
American Physical Society
Referencias:
Año: 2009 vol. 80 p. 21114 - 21127
ISSN:
1063-651X
Resumen:
We present a lattice spin model that mimics a system of interacting particles through a short-range repulsive
potential and a long-range attractive power-law decaying potential. We perform a detailed analysis of the
general equilibrium phase diagram of the model at finite temperature, showing that the only possible equilibrium
phases are the ferromagnetic and the antiferromagnetic ones. We then study the nonequilibrium behavior
of the model after a quench to subcritical temperatures, in the antiferromagnetic region of the phase diagram
region, where the pair interaction potential behaves in the same qualitative way as in a Lennard-Jones gas. We
find that even in the absence of quenched disorder or geometric frustration, the competition between interactions
gives rise to nonequilibrium disordered structures at low enough temperatures that strongly slow down
the relaxation of the system. This nonequilibrium state presents several features characteristic of glassy systems
such as subaging, nontrivial fuctuation dissipation relations, and possible logarithmic growth of free-energy
barriers to coarsening.