Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 45: Correlated Electrons: Poster Session

TT 45.106: Poster

Donnerstag, 29. März 2012, 15:00–19:00, Poster B

Embedded cluster approach for strongly correlated systems out of equilibrium — Michael Knap, Anna Fulterer, Martin Nuss, Wolfgang von der Linden, and •Enrico Arrigoni — Institute of Theoretical and Computational Physics, Graz University of Technology, 8010 Graz, Austria

We present a numerical approach to compute nonequilibrium properties of strongly-correlated quantum many-body systems. The method is based on the nonequilibrium Green’s function formalism combined with a treatment of strong correlations via cluster perturbation theory and its variational extensions. Upon including appropriate virtual bath parameters the method bridges to nonequilibrium dynamical mean-field theory.

We present results for steady-state transport across different spatially extended strongly-correlated regions, such as (i) a quantum wire, and (ii) a Hubbard layer displaying d-wave superconductivity. In the latter case, we discuss the effect of the bias voltage on superconducting properties. Time transient behavior is also discussed.