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Paper
Constraints on s-wave pairing in the Hubbard model
Abstract
We present an exact identity between the on-site and the extended s-wave pairing amplitudes in the Hubbard model. We prove that the extended s-wave pairing amplitude vanishes identically at half filling for both signs of U. Away from half filling, the existence of an on-site s-wave pairing is a necessary and sufficient condition for the existence of an extended s-wave pairing. This result gives rise to constraints on the possible symmetries of the superconducting gap in the Hubbard model. © 1990 The American Physical Society.