Bethe Ansatz for the open XXZ chain from functional relations at roots of unity

Abstract

We briefly review Bethe Ansatz solutions of the integrable open spin-1/2 XXZ quantum spin chain derived from functional relations obeyed by the transfer matrix at roots of unity.Comment: 10 pages, LaTeX; includes ws-procs9x6.cls and rotating_pr.sty (World Scientific proceedings style, 9 x 6 inch trim size); presented at the 23rd International Conference of Differential Geometric Methods in Theoretical Physics (DGMTP) at the Nankai Institute of Mathematics in Tianjin, China, 20-26 August 2005, and to appear in the Proceeding