Dynamical vertex approximation for the two-dimensional Hubbard model

  title={Dynamical vertex approximation for the two-dimensional Hubbard model},
  author={T. Schaefer and A. Toschi and K. Held},
  journal={Journal of Magnetism and Magnetic Materials},
  • T. Schaefer, A. Toschi, K. Held
  • Published 2016
  • Physics
  • Journal of Magnetism and Magnetic Materials
  • Abstract Recently, diagrammatic extensions of dynamical mean field theory (DMFT) have been proposed for including short- and long-range correlations beyond DMFT on an equal footing. We employ one of these, the dynamical vertex approximation (D Γ A), and study the two-dimensional Hubbard model on a square lattice. We define two transition lines in the phase diagram which correspond, respectively, to the opening of the gap in the nodal direction and throughout the Fermi surface. Our self-energy… CONTINUE READING
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