Geodesic
Exploration of spectrum of the energy operator of two-magnon system in the one-dimensional anisotropic Heisenberg ferromagnet with interaction of second neighbours
Teoretičeskaâ i matematičeskaâ fizika, Tome 107 (1996) no. 1, pp. 155-161 
S. M. Tashpulatov. Exploration of spectrum of the energy operator of two-magnon system in the one-dimensional anisotropic Heisenberg ferromagnet with interaction of second neighbours. Teoretičeskaâ i matematičeskaâ fizika, Tome 107 (1996) no. 1, pp. 155-161. http://geodesic.mathdoc.fr/item/TMF_1996_107_1_a12/
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     author = {S. M. Tashpulatov},
     title = {Exploration of spectrum of the energy operator of two-magnon system in the one-dimensional anisotropic {Heisenberg} ferromagnet with interaction of second neighbours},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {155--161},
     year = {1996},
     volume = {107},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1996_107_1_a12/}
}
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We investigate a physical system of two magnons in the one-dimensional anisotropic Heisenberg ferromagnet with the interaction up to two neighbours. We study the spectrum and bound states of the Hamiltonian of the two-magnon system. It is established that in some cases additional bound states can appear or disappear in comparison with the isotropic case.

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