Of spectrum and bound states of energy operator of two-magnon system in the two dimensional Heisenberg ferromagnet

摘要

In this paper spectrum and bound states of energy operator of two-magnon system in the two dimensional Heisenberg ferromagnet with interactions up to two unit distance are investigated. Conditions of existence of bound states and number of degenerace energy of their states are found. Demonstrated is the number of bound states of the system in the bond of metric.