Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-07-26
Phys. Rev. B 75, 134518 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 5 figures
Scientific paper
10.1103/PhysRevB.75.134518
The 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,\omega), 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.
Avella Adolfo
Mancini Ferdinando
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