Theory of single-particle properties of the Hubbard model

Details Theory of single-particle properties of the Hubbard model Theory of single-particle properties of the Hubbard model

1995-02-03

arxiv.org/abs/cond-mat/9502015v1

Europhys. Lett. 33, 159-164 (1996) (6 pages).

Physics

Condensed Matter

5 pages, latex, uuencoded figures, REVTEX Also available by direct request to yvilk@einstein.physique.usherb.ca

Scientific paper

10.1209/epl/i1996-00315-2

It is shown that it is possible to quantitatively explain quantum Monte Carlo results for the Green's function of the two-dimensional Hubbard model in the weak to intermediate coupling regime. The analytic approach includes vertex corrections in a paramagnon-like self-energy. All parameters are determined self-consistently. This approach clearly shows that in two dimensions Fermi-liquid quasiparticles disappear in the paramagnetic state when the antiferromagnetic correlation length becomes larger than the electronic thermal de Broglie wavelength.

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