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On the particle excitations in the XXZ- spin chain (1304.2908v2)
Published 10 Apr 2013 in math-ph, cond-mat.str-el, hep-th, and math.MP
Abstract: We continue to study the excited states for the XXZ- spin chain corresponding to the complex roots of the Bethe Ansatz equations with the imaginary part equal to $\pi/2$. We propose the particle-hole symmetry which relates the eigenstates build up from the two different pseudovacuum states. We find the XXX- spin chain limit for the eigenstates with the complex roots. We also comment on the low-energy excited states for the XXZ- spin chain.
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