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We investigate the delocalization transition appearing in an exclusionprocess with two internal states resp. on two parallel lanes. At thetransition, delocalized domain walls form in the density profiles of bothinternal states, in agreement with a mean-field approach. Remarkably, thetopology of the system's phase diagram allows for the delocalization of a(localized) domain wall when approaching the transition. We quantify the domainwall's delocalization close to the transition by analytic results obtainedwithin the framework of the domain wall picture. Power-law dependences of thedomain wall width on the distance to the delocalization transition as well ason the system size are uncovered, they agree with numerical results.

Domain wall delocalization, dynamics and fluctuations in an exclusion process with two internal states