Local Order and the gapped phase of the Hubbard model: a plaquette dynamical mean field investigation


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… (More)


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