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Physica B Condensed Matter

SCBA within composite operator method for the Hubbard model

S. Krivenko, Adolfo Avella, Francesco Paolo Mancini, Nikolay M. Plakida

Published Feb 17, 2005• 14 citations
Publisher
DOI
10.1016/j.physb.2005.01.186

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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 main idea of the COM is to describe interacting electrons in terms of the composite elementary excitations appearing in the system owing to strong correlations; the residual interactions among these excitations are treated within the SCBA. By analysing the spectral function A(k,ω) on varying the filling, we find, at high doping, the ordinary Fermi-liquid behaviour of a weakly interacting metal and, at low doping, the opening of a pseudogap, as reported for cuprates superconductors.