title: Totally asymmetric exclusion process on a ring with internal degrees of freedom.
abstract: A totally asymmetric exclusion process on a ring with ν nonconserved internal degrees of freedom, where particles hop forward with a rate that depends on their internal state, has been studied. We show, using a mapping of the model to a zero range process with ν different kinds of boxes, that steady-state weights can be written in a matrix product form and calculate the spatial correlations exactly. A comparison of the model with an equivalent conserved system reveals that unequal hopping rates of particles belonging to different internal states are responsible for the nontrivial correlations.
authors.affiliation: Theoretical Condensed Matter Physics Division, Saha Institute of Nuclear Physics, 1/AF Bidhan Nagar, Kolkata 700064, India. urna.basu@saha.ac.in
authors.forename: Urna
authors.initials: U
authors.lastname: Basu
authors.forename: P K
authors.initials: PK
authors.lastname: Mohanty