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The XXX spin- \(\tfrac{1}{2}\) Heisenberg chain with non-diagonal boundary fields is a cornerstone model in the study of integrable systems with open boundaries. Despite its significance, solving this model exactly poses significant challenges due to the breaking of U(1) symmetry. Building on the off-diagonal Bethe Ansatz (ODBA), we analyze a set of non-linear integral equations (NLIEs) that characterize the exact spectrum of the model.

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On the XXX spin-1/2 quantum chain with non-diagonal boundary fields

  • 章节

  • 发表日期：

    2026年

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  • Andreas Klümper,
  • Xin Zhang

摘要

The XXX spin- \(\tfrac{1}{2}\) Heisenberg chain with non-diagonal boundary fields is a cornerstone model in the study of integrable systems with open boundaries. Despite its significance, solving this model exactly poses significant challenges due to the breaking of U(1) symmetry. Building on the off-diagonal Bethe Ansatz (ODBA), we analyze a set of non-linear integral equations (NLIEs) that characterize the exact spectrum of the model.