Abstract
We have examined the two-dimensional repulsive extended Hubbard model on a square lattice, using standard many-body diagrammatic techniques. By summing an infinite series of two renormalized loops for the self-energy, we have found that for specific regions in the parameter space of (U,W), the renormalized Coulomb interaction can become attractive. In addition we have also studied the effects of second-order diagrams, pertaining to paramagnon effects in BCS superconductors. Our results are in agreement with numerical simulation studies and may form the basis for a mechanism of high-${\mathit{T}}_{\mathit{c}}$ superconductors.
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