Guan, X. W.; Foerster, A.; Grimm, U.; Römer, R. A. and Schreiber, M.
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|DOI (Digital Object Identifier) Link:||http://doi.org/10.1016/S0550-3213(01)00452-7|
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A strongly correlated electron system associated with the quantum superalgebra U_q[osp(2|2)] is studied in the framework of the quantum inverse scattering method. By solving the graded reflection equation, two classes of boundary-reflection K-matrices leading to four kinds of possible boundary interaction terms are found. Performing the algebraic Bethe ansatz, we diagonalize the two-level transfer matrices which characterize the charge and the spin degrees of freedom, respectively. The Bethe-ansatz equations, the eigenvalues of the transfer matrices and the energy spectrum are presented explicitly. We also construct two impurities coupled to the boundaries. In the thermodynamic limit, the ground state properties and impurity effects are discussed.
|Item Type:||Journal Article|
|Keywords:||Hubbard model; Yangï¿½Baxter equation; reflection equations; algebraic Bethe ansatz|
|Academic Unit/Department:||Faculty of Science, Technology, Engineering and Mathematics (STEM) > Mathematics and Statistics
Faculty of Science, Technology, Engineering and Mathematics (STEM)
|Depositing User:||Uwe Grimm|
|Date Deposited:||13 Feb 2007|
|Last Modified:||04 Aug 2016 06:39|
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