Quasiparticle anisotropy and pseudogap formation: A weak-coupling renormalization-group analysis

A. Kampf, A. A. Katanin

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2 Citations (Scopus)


We calculate the self-energy at weak-coupling for the t-t′ Hubbard model within the one-loop functional RG approach. At van Hove (vH) band fillings the quasiparticle (qp) concept is found invalid at kF=(π, 0). At low temperature the qp weight along the Fermi surface continuously vanishes from a finite value at the zone diagonal towards the (π, 0) point. Away from vH band fillings the qp peak is formed inside a pseudogap of size Δ, and within a finite frequency window |ω|≪Δ around the Fermi energy the electronic self-energy has the conventional Fermi-liquid form. With increasing separation between Fermi level and vHs the spectral anomalies gradually disappear.

Original languageEnglish
Pages (from-to)146-149
Number of pages4
JournalJournal of Physics and Chemistry of Solids
Issue number1-3
Publication statusPublished - Jan 2006
Externally publishedYes


  • A. Oxides
  • O. Electrical properties


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