PHASE-DIAGRAM OF ONE-DIMENSIONAL DRIVEN LATTICE GASES WITH OPEN BOUNDARIES

We consider the asymmetric simple exclusion process (ASEP) with open b oundaries and other driven stochastic lattice gases of particles enter ing, hopping and leaving a one-dimensional lattice. The long-term syst em dynamics, stationary states, and the nature of phase transitions be tween steady states can be understood in terms of the interplay of two characteristic velocities, the collective velocity and the shock (dom ain wall) velocity. This interplay results in two distinct types of do main walls whose dynamics is computed. We conclude that the phase diag ram of the ASEP is generic for one-component driven lattice gases with a single maximum in the current-density relation.