New superconducting states in the Hubbard model
Sze-Shiang Feng, Bin Wang, Elcio Abdalla
Abstract
By acting on the excited states at half-filling in the positive-U Hubbard model with the η-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.
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