Eichenberger, David Baeriswyl, Dionys 2007-04-04 A trial wave function is proposed for studying the instability of the two-dimensional Hubbard model with respect to d-wave superconductivity. Double occupancy is reduced in a similar way as in previous variational studies, but in addition our wave function both enhances the delocalization of holes and induces a kinetic exchange between the electron spins. These refinements lead to a large energy gain, while the pairing appears to be weakly affected by the additional term in the variational wave function. application/pdf https://folia.unifr.ch/global/documents/300564 https://folia.unifr.ch/documents/300564/files/eichenberger_sgs.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1016/j.physc.2007.03.366 info:eu-repo/semantics/openAccess License undefined Physica C: Superconductivity. - 2007, vol. 460-462, no. 2, p. 1153-1154 info:eu-repo/classification/udc/53 Superconducting ground state of the two-dimensional Hubbard model: a variational study http://purl.org/coar/resource_type/c_6501