Abstract
The two-dimensional Hubbard model is studied within the composite operator method (COM) with the electronic self-energy computed in the self-consistent Born approximation (SCBA). The COM describes interacting electrons in terms of the composite elementary excitations appearing in the system owing to the strong correlations; the residual interactions among these excitations are treated within the SCBA. The behavior of the momentum distribution function n ( k ) is analyzed for various values of filling. In contrast with the ordinary Fermi-liquid behavior found at high doping, non-Fermi-liquid features in n ( k ) are reported for low doping. These anomalous features are explained by looking at the strong antiferromagnetic correlations developing in the system in proximity of half-filling.
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