Ff. Assaad et al., QUANTUM TRANSITION BETWEEN AN ANTIFERROMAGNETIC MOTT INSULATOR AND D(X2-Y2) SUPERCONDUCTOR IN 2 DIMENSIONS, Physical review letters, 77(22), 1996, pp. 4592-4595
We consider a Hubbard model on a square lattice with an additional int
eraction, W, which depends upon the square of the near-neighbor hoppin
g. At half filling and a constant value of the Hubbard repulsion, incr
easing the strength of the interaction W drives the system from an ant
iferromagnetic Mott insulator to a d(x2-y2) superconductor. This concl
usion is reached on the basis of zero temperature quantum Monte Carlo
simulations on lattice sizes up to 16 x 16.