Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 400, Issue -, Pages 107-111Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2015.07.103
Keywords
Strongly correlated electron systems; Mott-Hubbard transition
Funding
- Austrian Science Fund (FWF) [W1243 Solid4Fun]
- SFB ViCoM [F41]
- European Research Council under the European Union's Seventh Framework Programme (FP)/ERC [306447]
- Austrian Science Fund (FWF) [W1243] Funding Source: Austrian Science Fund (FWF)
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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 Gamma 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 data show that the evolution between the two regimes occurs in a gradual way (crossover) and also that at low enough temperatures the whole Fermi surface is always gapped. Furthermore, we present a comparison of our DTA calculations at a parameter set where data obtained by other techniques are available. (C) 2015 Elsevier B.V. All rights reserved.
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