Ground state and low excitations of an integrable chain with alternating spins
Abstract
An anisotropic integrable spin chain, consisting of spins s = 1 and 03054470/29/9/010/img1, is investigated [1]. It is characterized by two real parameters 03054470/29/9/010/img2 and 03054470/29/9/010/img3, the coupling constants of the spin interactions. For the case 03054470/29/9/010/img4 and 03054470/29/9/010/img5 the groundstate 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 groundstate 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.
 Publication:

Journal of Physics A Mathematical General
 Pub Date:
 May 1996
 DOI:
 10.1088/03054470/29/9/010
 arXiv:
 arXiv:hepth/9605040
 Bibcode:
 1996JPhA...29.1949M
 Keywords:

 High Energy Physics  Theory
 EPrint:
 16 pages, LaTeX, uses ioplppt.sty and PicTeX macros