Novel quenched disorder fixed point in a two-temperature lattice gas
Center for Stochastic Processes in Science and Engineering
and Department of Physics Virginia Tech, Blacksburg, VA 24061-0435, USA
Accepted: 31 January 1997
We investigate the effects of quenched randomness on the universal properties of a two-temperature lattice gas. The disorder modifies the dynamical transition rates of the system in an anisotropic fashion, giving rise to a new fixed point. We determine the associated scaling form of the structure factor, quoting critical exponents to two-loop order in an expansion around the upper critical dimension . The close relationship with another quenched disorder fixed point, discovered recently in this model, is discussed.
PACS: 64.60.Cn – Order-disorder transformations; statistical mechanics of model systems / 05.70.Fh – Phase transitions: general aspects / 82.20.Mj – Nonequilibrium kinetics
© EDP Sciences, 1997