Toward a Nonequilibrium Green functions approach to diffusion in   strongly coupled finite quantum systems
  Transport properties of strongly correlated quantum systems are of central interest in condensed matter, ultracold atoms and in dense plasmas. There, the proper treatment of strong correlations poses a great challenge to theory. Here, we apply a Nonequilibrium Green Functions approach using a lattice model as a basic system. This allow us to treat a finite spatially inhomogeneous system with an arbitrary nonequilibrium initial state. Placing all particles initially to one side of the system allows for a nonequilibrium study of diffusion. Strong correlation effects are incorporated via T-matrix selfenergies. 
M. Bonitz, N. Schluenzen, and S. Hermanns
cond-mat.str-el physics.plasm-ph