Ground state and low excitations of an integrable chain with alternating spins
- 7 May 1996
- journal article
- Published by IOP Publishing in Journal of Physics A: General Physics
- Vol. 29 (9) , 1949-1960
- https://doi.org/10.1088/0305-4470/29/9/010
Abstract
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 solutions of Bethe ansatz equations (BAE) in analogy to [13]. The dispersion law of these excitations is calculated numerically.Keywords
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