Non-KPZ modes in two-species driven diffusive systems

Abstract

Using mode coupling theory and dynamical Monte-Carlo simulations we investigate the scaling behaviour of the dynamical structure function of a two-species asymmetric simple exclusion process, consisting of two coupled single-lane asymmetric simple exclusion processes. We demonstrate the appearence of a superdiffusive mode with dynamical exponent $z=5/3$ in the density fluctuations, along with a KPZ mode with $z=3/2$ and argue that this phenomenon is generic for short-ranged driven diffusive systems with more than one conserved density. When the dynamics is symmetric under the interchange of the two lanes a diffusive mode with $z=2$ appears instead of the non-KPZ superdiffusive mode.

5 pages, 7 figures

References in corpus (3)

• Exact scaling functions for one-dimensional stationary KPZ growth
• Spectrum in multi-species asymmetric simple exclusion process on a ring
• Exact shock measures and steady-state selection in a driven diffusive system with two conserved densities

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