Exact solutions for the periodic Anderson model in 2D: A Non-Fermi liquid state in normal phase
Abstract
Presenting exact solutions for the two dimensional periodic Anderson model with finite and nonzero on-site interaction U>0, we are describing a rigorous non-Fermi liquid phase in normal phase and 2D. This new state emerges in multi-band 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, 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, is highly degenerated and paramagnetic. A gap is present at high U in the density of low lying excitations. During low lying excitations, quasi-particles are not created above the Fermi level, only the number of particles at the Fermi energy increases.
Cite
@article{arxiv.cond-mat/0104195,
title = {Exact solutions for the periodic Anderson model in 2D: A Non-Fermi liquid state in normal phase},
author = {Peter Gurin and Zsolt Gulacsi},
journal= {arXiv preprint arXiv:cond-mat/0104195},
year = {2009}
}
Comments
46 pages, 2 ps files, to be published in Phys. Rev. B