Berlin 2008 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 8: Superfluidity and Bose Einstein Condensation

DY 8.6: Talk

Monday, February 25, 2008, 18:15–18:30, MA 001

Functional renormalization group approach to the Anderson impurity model: partial bosonization in two competing channels — •Jose Juan Ramos Cardenas and Peter Kopietz — Institut für Theoretische Physik, Universität Frankfurt, Germany

We take into account the dominant singularities in two competing interaction channels of strongly interacting Fermi systems via a generalization of the collective field functional renormalization group approach developed by Schütz, Bartosch and Kopietz [Phys. Rev. B 72, 035107 (2005)]. Our method is based on the introduction of two independent bosonic Hubbard-Stratonovich fields describing competing collective fluctuations of the underlying Fermi system. As an application, we study the Anderson impurity model where the interference between the spin-singlet particle-hole and particle-particle channels is essential to correctly describe the strong-coupling crossover to the Fermi-liquid regime at energy scales below the Kondo temperature.