Volume 55, Number 3, August 2001
|Page(s)||376 - 382|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 December 2003|
Angle-resolved loss of Landau quasiparticles in 2D Hubbard model
Laboratoire de Physique Théorique et Hautes
Energies Universités Paris VI Pierre et Marie
Curie - Paris VII Denis Diderot 2 place Jussieu,
75252 Paris Cédex 05, France
Accepted: 28 May 2001
The problem of weakly correlated electrons on a square lattice is studied theoretically. A simple renormalization group scheme for the angle-resolved weight of the quasiparticles at the Fermi surface is presented and applied to the Hubbard model. Upon reduction of the cutoff, the Fermi surface is progressively destroyed from the van Hove points toward the zone diagonals. Due to the renormalized , divergences of both antiferromagnetic and superconducting correlation functions are suppressed at the critical scale where interactions diverge.
PACS: 71.10.Fd – Lattice fermion models (Hubbard model, etc.) / 74.72.-h – High- compounds
© EDP Sciences, 2001
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