Local order and the gapped phase of the Hubbard model : A plaquette dynamical mean-field investigation

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • E. Gull
  • P. Werner
  • X. Wang
  • M. Troyer
  • A. J. Millis

Detail(s)

Original languageEnglish
Article number37009
Journal / PublicationEPL
Volume84
Issue number3
Publication statusPublished - 1 Nov 2008
Externally publishedYes

Abstract

The four-site "DCA" method of including intersite correlations in the dynamical mean-field theory is used to investigate the metal-insulator transition in the Hubbard model. At half-filling a gap-opening transition is found to occur as the interaction strength is increased beyond a critical value. The gapped behavior found in the 4-site DCA approximation is shown to be associated with the onset of strong antiferromagnetic and singlet correlations and the transition is found to be potential energy driven. It is thus more accurately described as a Slater phenomenon (induced by strong short-range order) than as a Mott phenomenon. Doping the gapped phase leads to a non-Fermi-liquid state with a Fermi surface only in the nodal regions and a pseudogap in the antinodal regions at lower dopings x≲0.15 and to a Fermi-liquid phase at higher dopings. © 2008 Europhysics Letters Association.

Citation Format(s)

Local order and the gapped phase of the Hubbard model : A plaquette dynamical mean-field investigation. / Gull, E.; Werner, P.; Wang, X.; Troyer, M.; Millis, A. J.

In: EPL, Vol. 84, No. 3, 37009, 01.11.2008.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review