Exact solutions for the periodic Anderson model in two dimensions: A non-fermi-liquid state in the normal phase

Peter Gurin, Zsolt Gulácsi

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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 nk- together with its derivatives of any order is continuous. The state possesses a well-defined Fermi energy (ef), 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 eF increases.

Original languageEnglish
Article number045118
Pages (from-to)451181-4511820
Number of pages4060640
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume64
Issue number4
Publication statusPublished - Jul 15 2001

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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