Anomalous interfacial correlations in non-equilibrium anisotropic systems

Abstract

Low-temperature interfacial properties of several driven, non-equilibrium lattice gases in steady states are studied with computer simulations. The drives are directed along the tangent to the interface. By focusing on the small-momentum behaviour of the height-height correlation, G(q), the authors determine that the longitudinal spatial isotropy symmetry is relevant to the long-distance behaviour. For the case where the sign of the drive is random in time, the analytically predicted G(q) approximately q-1 is observed for the first time. For uniform drive, they determine numerically G(q) approximately q-2+n, with eta approximately= 1.33. This suggests that the effective stiffness of the interfaces is enhanced on large scales, consistent with roughness being severely suppressed.