Pseudogaps in Strongly Correlated Metals

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dc.creatorSadovskii, M. V.
dc.creatorNekrasov, I. A.
dc.creatorKuchinskii, E. Z.
dc.creatorPruschke, Th.
dc.creatorAnisimov, V. I.
dc.date2005-02-25
dc.date2005-03-04
dc.date.accessioned2026-07-07T08:26:11Z
dc.date.available2026-07-07T08:26:11Z
dc.descriptionWe generalize the dynamical-mean field (DMFT) approximation by including into the DMFT equations some length scale via a (momentum dependent) ``external'' self-energy Σ_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+Σ_k 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+Σ_k 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+Σ_k show a pseudogap formation near the Fermi level of the quasiparticle band.
dc.description35 pages, 16 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0502612
dc.identifierhttp://arxiv.org/abs/cond-mat/0502612
dc.identifierPhys. Rev. B 72, 155105 (2005)
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/136858
dc.subjectStrongly Correlated Electrons
dc.titlePseudogaps in Strongly Correlated Metals
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