Wm. Liu et al., THE 2-SOLITON BOUND-STATE SOLUTION IN AN ORDER-PARAMETER-PRESERVING ANTIFERROMAGNET, Communications in Theoretical Physics, 20(4), 1993, pp. 427-432
Employing the Dyson-Maleev transformation and the coherent state ansat
z, the two-soliton bound-state solution in an order-parameter-preservi
ng antiferromagnet is investigated by using the method of multiple sca
les and long-wavelength approximation.