Underdoped cuprates phenomenology in the 2D Hubbard model within COM(SCBA)

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dc.creatorAvella, Adolfo
dc.creatorMancini, Ferdinando
dc.date2006-07-26
dc.date.accessioned2026-07-07T08:11:10Z
dc.date.available2026-07-07T08:11:10Z
dc.descriptionThe two-dimensional Hubbard model is studied within the Composite Operator Method (COM) with the residual self-energy computed in the Self-Consistent Born Approximation (SCBA). COM describes interacting electrons in terms of the new elementary excitations appearing in the system owing to strong correlations; residual interactions among these excitations are treated within the SCBA. The anomalous features appearing in the spectral function A(k,ω), the momentum distribution function n(k) and the Fermi surface are analyzed for various values of the filling (from overdoped to underdoped region) in the intermediate coupling regime at low temperatures. For low doping, in contrast with the ordinary Fermi-liquid behavior of a weakly-correlated metal found at high doping, we report the opening of a pseudogap and some non-Fermi-liquid features as measured for cuprates superconductors. In addition, we show the presence of kinks in the calculated electronic dispersion in agreement with ARPES data.
dc.description5 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0607701
dc.identifierhttp://arxiv.org/abs/cond-mat/0607701
dc.identifierPhys. Rev. B 75, 134518 (2007)
dc.identifierdoi:10.1103/PhysRevB.75.134518
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/132039
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleUnderdoped cuprates phenomenology in the 2D Hubbard model within COM(SCBA)
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