Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-05-26
EPL 84 (2008), 37009
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
10.1209/0295-5075/84/37009
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 ranged 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 $x \lesssim 0.15$ and to a Fermi liquid phase at higher dopings.
Gull Emanuel
Millis Andrew. J.
Troyer Matthias
Wang Xin
Werner Philipp
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