New integrable version of the degenerate supersymmetric t-J model

Abstract A new integrable version of the degenerate supersymmetric t-J model is proposed. In this formulation, instead of restricting the single occupancy of electrons at each lattice site we may have up to two electrons at each site. As a requirement of exact integrability the hopping interaction turns out to be correlated with the density of electrons in the neighboring sites. The exact solution of the model is obtained through the coordinate Bethe ansatz.