New exactly solvable model of strongly correlated electrons motivated by high-Tc superconductivity
Fabian H. L. Essler, Vladimir E. Korepin, Kareljan Schoutens
DOI 10.1103/PhysRevLett.68.2960 · Physical Review Letters
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Abstract
We present a new model describing strongly correlated electrons on a general d-dimensional lattice. It is an extended Hubbard model and it contains the t-J model as a special case. The model naturally describes local electron pairs, which can move coherently at arbitrary momentum. By using an η-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 number of dimensions. On a one-dimensional lattice, the model is exactly solvable by Bethe ansatz.
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