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arXiv:0806.2404 · Nuclear Physics B

Algebraic Bethe ansatz for U(1) invariant integrable models: The method and general results

C.S. Melo, Marcio Jose Martins

Published Jul 31, 2008• 13 citations
arXivHTMLPDF
DOI
10.1016/j.nuclphysb.2008.07.023

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We have recently constructed a large class of open quantum spin chains which have quantum-algebra symmetry and which are integrable. We show here that these models can be exactly solved using a generalization of the analytical Bethe Ansatz (BA) method. In particular, we determine in this way the spectrum of the transfer matrices of the Uq[su(2)]-invariant spin chains associated with A1(1) and A2(2) in the fundamental representation. The quantum-algebra invariance of these models plays an essential role in obtaining these results. The BA equations for these open chains are “doubled” with respect to the BA equations for the corresponding closed chains.