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Integrable variant of the one-dimensional Hubbard model

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arxiv cond-mat/0103059 v1 pith:NVHI4NSH submitted 2001-03-02 cond-mat.str-el cond-mat.stat-mech

X.-W. Guan , A. Foerster , J. Links , H.-Q Zhou , A. Prestes Tonel , R.H. McKenzie This is my paper
classification cond-mat.str-elcond-mat.stat-mech
keywords modelalgebraansatzbethehubbardintegrableone-dimensionalquantum
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abstract

A new integrable model which is a variant of the one-dimensional Hubbard model is proposed. The integrability of the model is verified by presenting the associated quantum R-matrix which satisfies the Yang-Baxter equation. We argue that the new model possesses the SO(4) algebra symmetry, which contains a representation of the $\eta$-pairing SU(2) algebra and a spin SU(2) algebra. Additionally, the algebraic Bethe ansatz is studied by means of the quantum inverse scattering method. The spectrum of the Hamiltonian, eigenvectors, as well as the Bethe ansatz equations, are discussed.

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