Boundary-drive–induced formation of aggregate condensates in stochastic transport with short-range interactions

¹ Institut für Theoretische Physik, Universität Leipzig - Postfach 100 920, 04009 Leipzig, Germany
² School of Engineering and Science, Jacobs University Bremen - P.O. Box 750561, 28725 Bremen, Germany

^(a) hannes.nagel@itp.uni-leipzig.de
^(b) h.ortmanns@jacobs-university.de
^(c) wolfhard.janke@itp.uni-leipzig.de

Received: 1 July 2015
Accepted: 25 July 2015

Abstract

We discuss the effects of particle exchange through open boundaries and the induced drive on the phase structure and condensation phenomena of a stochastic transport process with tunable short-range interactions featuring pair-factorized steady states (PFSS) in the closed system. In this model, the steady state of the particle hopping process can be tuned to yield properties from the zero-range process (ZRP) condensation model to those of models with spatially extended condensates. By varying the particle exchange rates as well as the presence of a global drift, we observe a phase transition from a free particle gas to a phase with condensates aggregated to the boundaries. While this transition is similar to previous results for the ZRP, we find that the mechanism is different as the presence of the boundary actually influences the interaction due to the non-zero interaction range.