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We show that the exact ground state for a class of extended Hubbard modelsincluding bond-charge, exchange, and pair-hopping terms, is the Yang"eta-paired" state for any non-vanishing value of the pair-hopping amplitude,at least when the on-site Coulomb interaction is attractive enough and theremaining physical parameters satisfy a single constraint. The ground state isthus rigorously superconducting. Our result holds on a bipartite lattice in anydimension, at any band filling, and for arbitrary electron hopping.Comment: 12 page

Rigorous results on superconducting ground states for attractive extended Hubbard models