Volume 44, Number 2, October II 1998
|Page(s)||235 - 241|
|Section||Condensed matter: electronic structure, electrical, magneticand optical properties|
|Published online||01 September 2002|
Weakly correlated electrons on a square lattice: A renormalization group theory
Laboratoire de Physique des Solides, Université Paris-Sud - 91405 Orsay, France
Institut für Theoretische Physik der Freien Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
Accepted: 3 September 1998
We study the weakly interacting Hubbard model on the square lattice using a one-loop renormalization group approach. The transition temperature Tc between the metallic and (nearly) ordered states is found. In the parquet regime , the dominant correlations at temperatures below Tc are antiferromagnetic, while in the BCS regime at Tc the d-wave singlet pairing susceptibility is most divergent.
PACS: 74.20.Mn – Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.) / 74.25.Dw – Superconductivity phase diagrams / 75.30.Fv – Spin-density waves
© EDP Sciences, 1998
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