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Type: Artigo de periódico
Title: Effect of strong correlations and static diagonal disorder in the d = infinity Hubbard model
Author: Laad, MS
Craco, L
Muller-Hartmann, E
Abstract: We investigate the effects of static, diagonal disorder in the d = infinity Hubbard model by treating the dynamical effects of local Hubbard correlations and disorder on an equal footing. This is achieved by a proper combination of the iterated perturbation theory and the coherent-potential approximation. Within the paramagnetic phase, we find that the renormalized Fermi-liquid metal phase of the pure Hubbard model is stable against disorder for small disorder strengths. With increasing disorder, strong resonant scattering effects destroy low-energy Fermi-liquid coherence, leading to an incoherent metallic state off half-filling. Finally, for large enough disorder, a continuous transition to the disordered insulating phase occurs. The nature of the incoherent metallic phase, as well as the effects of the low-energy coherence (incoherence) on optical conductivity and electronic Raman spectra, are considered in detail.
Country: EUA
Editor: American Physical Soc
Citation: Physical Review B. American Physical Soc, v. 64, n. 19, n. art. no., n. 195114, 2001.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.64.195114
Date Issue: 2001
Appears in Collections:Unicamp - Artigos e Outros Documentos

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