Non-diagonal reflection for the non-critical XXZ model

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Doikou, Anastasia
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The most general physical boundary $S$-matrix for the open XXZ spin chain in the non-critical regime ($\cosh (\eta)>1$) is derived starting from the bare Bethe ansazt equations. The boundary $S$-matrix as expected is expressed in terms of $\Gamma_q$-functions. In the isotropic limit corresponding results for the open XXX chain are also reproduced.
Comment: 8 pages Latex
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High Energy Physics - Theory, Condensed Matter - Statistical Mechanics, Mathematical Physics, Nonlinear Sciences - Exactly Solvable and Integrable Systems
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