Steady states in asymmetric exclusion processes with reactions: Fluctuations and non-mean field behaviour
Rohn Chatterjee, Atri Goswami, Sudip Mukherjee
Abstract
We study an totally asymmetric simple exclusion process (TASEP) in an open geometry. We couple TASEP with simple reactions in the form of production (birth) and degradation (death) due to over crowding taking place in the bulk. We investigate the steady states, which are generically space-dependent. Phase coexistences are also possible for some choices of the model parameters. We study the system by mean-field theories (MFT) supplemented by extensive Monte-Carlo simulations (MCS). Intriguingly, unlike oridinary TASEP and other related models, configuration-dependent bulk reactions in a TASEP model can make nearest-neighbour correlations quantitatively important even in an open driven system where mean-field theory would ordinarily be expected to provide a useful description. We attribute this to the correlation effects ignored in MFT. We numerically quantify this correlation effect.
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