Fermi-liquid versus non-Fermi-liquid behavior in a two-band model of high-temperature superconductivity
C. Castellani, G. Kotliar
DOI 10.1103/PhysRevB.39.2876 · Physical Review B
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Abstract
We solve an extended Hubbard model describing a system with two N-fold degenerate bands in the limit N=∞. The system exhibits a phase transition from Fermi liquid to non-Fermi liquid as the exchange interaction becomes comparable with the hybridization energy.
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