Exact bounds on the ground-state energy of the infinite-U Hubbard model
arXiv:cond-mat/0009359 · doi:10.1103/PhysRevB.62.15277
Abstract
We give upper and lower bounds for the ground-state energy of the infinite-U Hubbard model. In two dimensions, using these bounds we are able to rule out the possibility of phase separation between the undoped-insulating state and an hole-rich state.
2 pages, 1 figure, to appear in Phys. Rev. B