Anomalous Resonance of the Symmetric Single-Impurity Anderson Model in the Presence of Pairing Fluctuations

Abstract

We consider the symmetric single-impurity Anderson model in the presence of pairing fluctuations. In the isotropic limit, the degrees of freedom of the local impurity are separated into hybridizing and non-hybridizing modes. The self-energy for the hybridizing modes can be obtained exactly, leading to two subbands centered at $\pm U/2$. For the non-hybridizing modes, the second order perturbation yields a singular resonance of the marginal Fermi liquid form. By multiplicative renomalization, the self-energy is derived exactly, showing the resonance is pinned at the Fermi level, while its strength is weakened by renormalization.

4 pages, revtex, no figures. To be published in Physical Review Letters

References in corpus (2)

• Non Fermi-Liquid States and Pairing of a general Model of Copper-Oxide Metals
• Pedestrian Approach to the Two-Channel Kondo Model

Cited by in corpus (1)

• On the Origin of the Non-Fermi Liquid Behavior of SrRuO_{3}