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Asymmetric coupling in two-lane simple exclusion process with Langmuir kinetics: phase diagrams and boundary layers

We study an open system composed of two parallel totally asymmetric simple exclusion processes with particle attachment and detachment in the bulk. The particles are allowed to change their lane from lane-A to lane-B, but not conversely. We investigate the steady-state behavior of the system using boundary layer analysis on continuum mean-field equations to provide the phase diagram. The structure of the phase diagram is quite complex and provides a complete insight about the steady-state dynamics. We examine two kinds of transitions in the phase plane: bulk transitions and surface transitions, qualitatively as well as quantitatively. The dynamics of shock formation, localization and their dependence on the system parameters and boundary rates have been investigated. We also justify the non-existence of downward shock in both the lanes using fixed point theory. Further, we examine the effect of increasing lane-changing rate on the steady-state dynamics and observe that the number of steady-state phases reduces with increase in lane-changing rate. Our theoretical results are supported with extensive Monte-Carlo simulation results.