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DY: Fachverband Dynamik und Statistische Physik

DY 28: Statistical Physics far from Equilibrium

DY 28.1: Talk

Thursday, March 17, 2011, 10:15–10:30, HÜL 186

Nonequilibrium steady states in contact: Approximate thermodynamic structure and zeroth law for driven lattice gases — •Punyabrata Pradhan, Christian Amann, and Udo Seifert — II. Institut für Theoretische Physik, Universität Stuttgart, 70550 Stuttgart, Germany

We explore a class of nonequilibrium systems, called driven lattice gases, for the existence of an intensive thermodynamic variable which could determine “equilibration” between two such nonequilibrium systems kept in weak contact [1]. We numerically check that there exists an intensive thermodynamic variable, like equilibrium chemical potential, which equalize in the final “equilibrated” steady state when two initially separated driven lattice gases are brought into contact and allowed to exchange particles with total number of particles conserved. We find that these systems satisfy surprisingly simple thermodynamic laws, such as the zeroth law and the fluctuation-response relation between the particle-number fluctuation and the corresponding susceptibility remarkably well. However at higher densities, small but observable deviations from these laws occur due to nontrivial contact dynamics and the presence of long-range spatial correlations.

Reference: [1] P. Pradhan, C. P. Amann and U. Seifert, Phys. Rev. Lett. 105, 150601 (2010).