Abstract
We present a two-channel driven lattice gas model with oppositely directed species movingon two parallel lanes with lane switching processes. We study the correlated lane switchingmechanism for particles so that switching may occur with finite probability only whenoppositely directed species meet on the same channel. The system is analyzed for a closedring with conserved total particle number. For asymmetric particle exchange between thelanes, the system exhibits a unique polarization phenomenon with segregation of oppositelydirected species between the two lanes. The polarization phenomenon can be understood asa consequence of the existence of an absorbing steady state. For symmetric exchangerate of particles between the lanes, the system remains unpolarized, with equalparticle density on both the lanes in the thermodynamic limit of large system size.We study the system using a combination of a mean field (MF) analysis andMonte Carlo simulations. The nature of phase segregation that we see for this systemis distinct from driven particle systems which are in contact with the particlereservoir. The features observed for this minimal model will have ramifications forbiofilament based intracellular transport, wherein cellular cargoes, e.g. organelles andvesicles, are transported by oppositely directed particles on multiple filamenttracks.
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