2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/20269We construct a new effective two-dimensional Hubbard model by taking the different electron occupancy on site into account. The mean field state of the new Hamiltonian gives rise to the gossamer superconducting state proposed by Laughlin recently(cond-mat/0209269).4 pages, 2 figures,some typo errors are correctedSuperconductivitytext