New non-Fermi liquid type behavior given by a two-band system in normal phase

Details New non-Fermi liquid type behavior given by a two-band system in normal phase New non-Fermi liquid type behavior given by a two-band system in normal phase

2001-05-21

arxiv.org/abs/cond-mat/0105399v1

Physics

Condensed Matter

Strongly Correlated Electrons

13 pages, 0 figures, Latex in .gz file, accepted for publication in Jour. of Phys. A. Letters

Scientific paper

We are reporting a new non-Fermi liquid type normal phase that has a well defined Fermi energy, but without showing any non-regularity in the momentum distribution function in the whole momentum space, the sharp Fermi momentum concept being undefinable. The system contains a natural built in gap that is visible in the physical properties of the system at nonzero temperatures. The presence of a flat band in multiband interacting Fermi systems with more than half filling is the key feature leading to such a ground state, which is not restricted to one spatial dimension and emerges in the proximity of an insulating phase.

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