Regensburg 2007 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 5: Correlated Electrons - (General) Theory
TT 5.10: Talk
Monday, March 26, 2007, 17:00–17:15, H18
Nonequilibrium functional renormalization group for interacting fermionic quantum systems — •Severin Jakobs1, Volker Meden2, and Herbert Schoeller1 — 1Institut für Theoretische Physik A, RWTH Aachen, Germany — 2Institut für Theoretische Physik, Universität Göttingen, Germany
We extend the functional renormalization group to the treatment of fermionic quantum systems within Keldysh formalism, providing a unified approach to equilibrium and nonequilibrium situations. To this end we introduce an imaginary frequency cut-off to the relevant fermi functions. In case of nonequilibrium, the flow parameter is furnished with additional real components corresponding to the different chemical potentials involved. Applying our method to nonlinear transport through an interacting quantum wire with two contact barriers, we find that nonequilibrium induces a change of the scaling exponents.