Order-parameter symmetries for magnetic and superconducting instabilities: Bethe-Salpeter analysis of functional renormalization-group solutions

A. A. Katanin, A. P. Kampf

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6 Citations (Scopus)

Abstract

The Bethe-Salpeter equation is combined with the temperature-cutoff functional renormalization group approach to analyze the order parameter structure for the leading instabilities of the 2D t-t′ Hubbard model. We find significant deviations from the conventional s-, p-, or d-wave forms, which is due to the frustration of antiferromagnetism at small and intermediate t′. With adding a direct antiferromagnetic spin-exchange coupling the eigenfunctions in the particle-hole channel have extended s-wave form, while in the particle-particle singlet pairing channel a higher angular momentum component arises besides the standard dx2-y2 wave component, which flattens the angular dependence of the gap. For t′ closer to t 2 we find a delicate competition of ferromagnetism and triplet pairing with a nontrivial pair-wavefunction.

Original languageEnglish
Article number205128
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number20
DOIs
Publication statusPublished - 15 Nov 2005
Externally publishedYes

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