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Variational Monte Carlo studies of gossamer superconductivity
We use a partially Gutzwiller projected BCS $d$-wave wave function with an antiferromagnetic-weighting factor to study the ground-state phase diagram of a half-filled Hubbard-Heisenberg model in a square lattice with nearest-neighbor hopping $t$ and a diagonal hopping ${t}^{\ensuremath{'}}$. The calculations are carried out by using variational Monte Carlo method which …