Ground state and low excitations of an integrable chain with alternating spins

  title={Ground state and low excitations of an integrable chain with alternating spins},
  author={S. Meissner and B.-D. Doerfel},
  journal={Journal of Physics A},
An anisotropic integrable spin chain, consisting of spins s = 1 and , is investigated [1]. It is characterized by two real parameters and , the coupling constants of the spin interactions. For the case and the ground-state configuration is obtained by means of thermodynamic Bethe ansatz. Furthermore, the low excitations are calculated. It turns out that apart from free magnon states being the holes in the ground-state rapidity distribution, there exist bound states given by special string… 

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