Anderson impurity in a correlated conduction band

Details Anderson impurity in a correlated conduction band Anderson impurity in a correlated conduction band

1999-12-21

arxiv.org/abs/cond-mat/9912396v2

Phys. Rev. Lett. 84, 4417 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

Final version, 4 pages RevTeX, 8 eps figures included

Scientific paper

10.1103/PhysRevLett.84.4417

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.

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