title: Anderson impurity in a correlated conduction band
abstract: We investigate the physics of a magnetic impurity with spin 1/2 in a correlated metallic host. Describing the band by a Hubbard Hamiltonian, the problem is analyzed using dynamical mean-field theory in combination with Wilson's nonperturbative numerical renormalization group. We present results for the single-particle density of states and the dynamical spin susceptibility at zero temperature. New spectral features (side peaks) are found which should be observable experimentally. In addition, we find a general enhancement of the Kondo scale due to correlations. Nevertheless, in the metallic phase, the Kondo scale always vanishes exponentially in the limit of small hybridization.
authors.affiliation: Theoretische Physik III, Elektronische Korrelationen und Magnetismus, Universitat Augsburg, 86135 Augsburg, Germany.
authors.initials: W
authors.lastname: Hofstetter
authors.initials: R
authors.lastname: Bulla
authors.initials: D
authors.lastname: Vollhardt