Influence of Spatial Correlations in Strongly Correlated Electron Systems: Extension to Dynamical Mean Field Approximation

• Kusunose Hiroaki

  Department of Physics, Tohoku University

Abstract

We propose a formalism to take account of the correction of the spatial fluctuations to the local self-energy obtained by the dynamical mean-field approximation. For this purpose, the approximate dynamical susceptibility in the framework of the iterated perturbation theory is proposed and examined. Using the formalism, it is demonstrated that the one-particle spectral intensity in the two-dimensional Hubbard model at half-filling exhibits the pseudo-gap behavior in the central coherent quasiparticle peak due to the critical antiferromagnetic fluctuation. The specific heat is considerably enhanced by the short-range order, which assists a tendency of the Mott localization showing the reduction of the double occupancy. We briefly discuss a formulation for the superconducting transition temperature in the present approximation.

Journal

• Journal of the Physical Society of Japan

  Journal of the Physical Society of Japan 75 (5), 054713-, 2006

  THE PHYSICAL SOCIETY OF JAPAN

Keywords

• dynamical mean field approximation
• spin fluctuation
• metal–insulator transition
• Hubbard model
• iterated perturbation theory
• anisotropic superconductivity

Details

• CRID: 1390001204190414080
• NII Article ID: 110004702341
• NII Article ID: 210000106163
• NII Book ID: AA00704814
• DOI: 10.1143/jpsj.75.054713
• BIBCODE: 2006JPSJ...75e4713K
• ISSN: 13474073
• ISSN: 00319015
• NDL BIB ID: 7908455
• Web Site: http://id.ndl.go.jp/bib/7908455
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7908455
• Web Site: http://journals.jps.jp/doi/pdf/10.1143/JPSJ.75.054713
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed