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A non-crossing approximation for the study of intersite correlations

  • Th. Maier
  • M. Jarrell
  • Th. Pruschke
  • J. Keller

Abstract:

We develop a Non-Crossing Approximation (NCA) for the effective cluster problem of the recently developed Dynamical Cluster Approximation (DCA). The DCA technique includes short-ranged correlations by mapping the lattice problem onto a self-consistently embedded periodic cluster of size \(\). It is a fully causal and systematic approximation to the full lattice problem, with corrections \(\) in two dimensions. The NCA we develop is a systematic approximation with corrections \(\). The method will be discussed in detail and results for the one-particle properties of the Hubbard model are shown. Near half filling, the spectra display pronounced features including a pseudogap and non-Fermi-liquid behavior due to short-ranged antiferromagnetic correlations.

PACS. 71.10.Fd Lattice fermion models (Hubbard model, etc.) - 71.27.+a Strongly correlated electron systems; heavy fermions - 75.20.Hr Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions 

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Copyright information

© EDP Sciences, Springer-Verlag, Società Italiana di Fisica 2000

Authors and Affiliations

  • Th. Maier
    • 1
  • M. Jarrell
    • 1
  • Th. Pruschke
    • 2
  • J. Keller
    • 2
  1. 1.Department of Physics, University of Cincinnati, Cincinnati, OH 45221, USAUS
  2. 2.Institut für Theoretische Physik I, Universität Regensburg, 93040 Regensburg, GermanyDE

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