Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-02-20
J. Phys. Soc. Jpn. 75 (2006) 054713
Physics
Condensed Matter
Strongly Correlated Electrons
9 pages, 12 figures, extended version to be publisded in J. Phys. Soc. Jpn
Scientific paper
10.1143/JPSJ.75.054713
We propose a formalism to take account of the correction of the spatial fluctuations to the local self-energy obtained by the dynamical mean-field approximation. For this purpose, the approximate dynamical susceptibility in the framework of the iterated perturbation theory is proposed and examined. Using the formalism, it is demonstrated that the one-particle spectral intensity in the two-dimensional Hubbard model at half-filling exhibits the pseudo-gap behavior in the central coherent quasiparticle peak due to the critical antiferromagnetic fluctuation. The specific heat is considerably enhanced by the short-range order, which assists a tendency of the Mott localization showing the reduction of the double occupancy. We briefly discuss a formulation for the superconducting transition temperature in the present approximation.
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