### Abstract

Presenting exact solutions for the two-dimensional periodic Anderson model with finite and nonzero on-site interactions U>0, we describe a rigorous non-Fermi-liquid phase in normal phase and two dimensions. This new state emerges in multiband interacting Fermi systems above half filling, being generated by a flat-band effect. The momentum distribution function n_{k}^{-} together with its derivatives of any order is continuous. The state possesses a well-defined Fermi energy (e^{f}), but the Fermi momentum concept is not definable, so the Fermi surface in k space is missing. The state emerges in the vicinity of a Mott insulating phase when lattice distortions are present and is highly degenerated and paramagnetic. A gap is present at high U in the density of low-lying excitations. During low-lying excitations, quasiparticles are not created above the Fermi level, only the number of particles at e_{F} increases.

Original language | English |
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Article number | 045118 |

Pages (from-to) | 451181-4511820 |

Number of pages | 4060640 |

Journal | Physical Review B - Condensed Matter and Materials Physics |

Volume | 64 |

Issue number | 4 |

Publication status | Published - Jul 15 2001 |

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### ASJC Scopus subject areas

- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics

### Cite this

*Physical Review B - Condensed Matter and Materials Physics*,

*64*(4), 451181-4511820. [045118].