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

Kampf, A.; Katanin, A. A.

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

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Katanin, A. A.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Kampf, A., & Katanin, A. A. (2006). Quasiparticle anisotropy and pseudogap formation: A weak-coupling renormalization-group analysis. Journal of Physics and Chemistry of Solids, 67(1-3), 146-149.

Cite as: https://hdl.handle.net/21.11116/0000-000F-02A3-6

Abstract

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 k(F)=(pi,
0). At low temperature the qp weight along the Fermi surface
continuously vanishes from a finite value at the zone diagonal towards
the (pi, 0) point. Away from vH band fillings the qp peak is formed
inside a pseudogap of size Delta, and within a finite frequency window
vertical bar omega vertical bar << Delta 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. (c) 2005 Elsevier Ltd. All rights
reserved.