Abstract
We have studied the two-dimensional Hubbard model by means of the Composite Operator Method (COM) within the Self-Consistent Born Approximation (SCBA) for the electronic self-energy. We have analyzed the complex features of the spectral function and the Fermi surface on varying the filling. At high doping, we have found the ordinary behavior of a weakly-correlated metal. For low doping, we have found instead the opening of a pseudogap as reported for cuprates superconductors.
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