New exactly solvable model of strongly correlated electrons motivated by high-Tc superconductivity.

@article{Essler1992NewES,
  title={New exactly solvable model of strongly correlated electrons motivated by high-Tc superconductivity.},
  author={Essler and Korepin and Schoutens},
  journal={Physical review letters},
  year={1992},
  volume={68 19},
  pages={
          2960-2963
        }
}
We present a new model describing strongly correlated electrons on a general {ital d}-dimensional lattice. It is an extended Hubbard model and it contains the {ital t}-{ital J} model as a special case. The model naturally describes local electron pairs, which can move coherently at arbitrary momentum. By using an {eta}-pairing mechanism we can construct eigenstates of the Hamiltonian with off-diagonal long-range order. In the attractive case the exact ground state is superconducting in any… 
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