Novel universality classes of coupled driven diffusive systems

Abstract

Motivated by the phenomenologies of dynamic roughening of strings in random media and magnetohydrodynamics, we examine the universal properties of driven diffusive system with coupled fields. We demonstrate that cross-correlations between the fields lead to amplitude-ratios and scaling exponents varying continuosly with the strength of these cross-correlations. The implications of these results for experimentally relevant systems are discussed.

To appear in Phys. Rev. E (Rapid Comm.) (2003)

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• Rough or crumpled: Strong coupling phases of a generalized Kardar-Parisi-Zhang surface
• Noise crosscorrelations can induce instabilities in coupled driven models
• Kardar-Parisi-Zhang universality in two-component driven diffusive models: Symmetry and renormalization group perspectives