Pseudogaps in Strongly Correlated Metals: A generalized dynamical mean-field theory approach

Details Pseudogaps in Strongly Correlated Metals: A generalized dynamical mean-field theory approach Pseudogaps in Strongly Correlated Metals: A generalized dynamical mean-field theory approach

2005-08-24

arxiv.org/abs/cond-mat/0508585v1

Phys. Rev. B 72, 155105 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

35 pages, 12 figures, extended version of cond-mat/0502612 as accepted in PRB

Scientific paper

10.1103/PhysRevB.72.155105

We generalize the dynamical-mean field (DMFT) approximation by including into the DMFT equations some length scale via a momentum dependent ``external'' self-energy S(k). This external self-energy describes non-local dynamical correlations induced by short-ranged collective SDW-like antiferromagnetic spin (or CDW-like charge) fluctuations. At high enough temperatures these fluctuations can be viewed as a quenched Gaussian random field with finite correlation length. This generalized DMFT+Sk approach is used for the numerical solution of the weakly doped one-band Hubbard model with repulsive Coulomb interaction on a square lattice with nearest and next nearest neighbour hopping. The effective single impurity problem in this generalized DMFT+Sk is solved by numerical renormalization group (NRG). Both types of strongly correlated metals, namely (i) doped Mott insulator and (ii) the case of bandwidth W~U (U - value of local Coulomb interaction) are considered. Densities of states, spectral functions and ARPES spectra calculated within DMFT+Sk show a pseudogap formation near the Fermi level of the quasiparticle band.

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