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

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.

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 Creators:
Kampf, A., Author
Katanin, A. A.1, Author           
Affiliations:
1Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370486              

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Free keywords: oxides; electrical properties
 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.

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Language(s): eng - English
 Dates: 2006
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 273535
ISI: 000236746600036
 Degree: -

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Title: Journal of Physics and Chemistry of Solids
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 67 (1-3) Sequence Number: - Start / End Page: 146 - 149 Identifier: ISSN: 0022-3697