Dynamical Cluster Approximation for the Periodic Anderson Model: Competition between Local and Non-local Correlations

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2 Citations (Scopus)

Abstract

The single particle excitation spectrum of the periodic Anderson model in two dimensions is calculated by using the dynamical cluster approximation (DCA). The DCA method is an extention of the dynamical mean field approximation, that is, the short range inter-site correlations are restored by considering the cluster. For the half filling model there is no sharp coherence peak at the Fermi level due to the antiferromagnetic Ruderman-Kittel-Kasuya-Yosida (RKKY)-like interaction. When the filling of the conduction electron band is small, there is a sharp coherence peak. It can be explaind that the effect of the RKKY-like interaction is weaker than that for the half filling model or the RKKY-like interaction changes to the ferromagnetic one. For the intermediate filling model the intensity of the coherence peak becomes very small.

Original languageEnglish
Pages (from-to)1166-1173
Number of pages8
Journaljournal of the physical society of japan
Volume71
Issue number4
DOIs
Publication statusPublished - 2002 Apr 1

Keywords

  • Dynamical cluster approximation
  • Periodic Anderson model
  • Single particle excitation spectrum

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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