1304.2908 (A. A. Ovchinnikov)

On the particle excitations in the XXZ- spin chain    [PDF]

A. A. Ovchinnikov

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.

View original: http://arxiv.org/abs/1304.2908