New superconducting states in the Hubbard model
arXiv:cond-mat/0103559 · doi:10.1016/S0375-9601(01)00731-9
Abstract
By acting on the excited states at half-filling in the positive- Hubbard model with the -pairing operators, we found some new superconducting states in the Hubbard model away from half-filling. Such eigenstates are different from the zero-pair and one-pair states introduced by Yang. It is shown that the one-pair states are not the ground-states and possess ODLRO.
4 pages, revtex, no figures