Exact resonating-valence-bond ground state and possibility of superconductivity in repulsive Hubbard models
Hal Tasaki
DOI 10.1103/PhysRevLett.70.3303 · Physical Review Letters
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Abstract
We generalize the exactly solvable Hubbard model with infinitely large on-site Coulomb repulsion recently introduced by Brandt and Giesekus. We point out that the exact ground state can be regarded as a resonating-valence-bond state, and argue that the state may exhibit superconductivity. The existence of a phase with singlet-pair ordering is demonstrated in a simple model on a tree.
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