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Analytic Bethe Ansatz for 1-D Hubbard model and twisted coupled XY model

Ruihong Yue, Tetsuo Deguchi

cond-matarXiv:cond-mat/9606039

Abstract

We found the eigenvalues of the transfer matrices for the 1-D Hubbard model and for the coupled XY model with twisted boundary condition by using the analytic Bethe Ansatz method. Under a particular condition the two models have the same Bethe Ansatz equations. We have also proved that the periodic 1-D Hubbard model is exactly equal to the coupled XY model with nontrivial twisted boundary condition at the level of hamiltonians and transfer matrices.

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