The interaction energy of the particle-hole pair in the XXZ-spin chain
arXiv:1908.09698 · doi:10.1088/1742-5468/ab3aee
Abstract
We calculate directly the interaction energy of the eigenstate with the single particle and the single hole for the XXZ-spin chain. We find the connection of this addition to the energy with the two-particle forward scattering phase shift function. The results can have applications to the calculation of the exponents of the threshold singularities in the correlators of the XXZ-spin chain.
12 pages
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