摘要
Introducing the coherent state ansatz and the time-dependent variational principle,we obtain the two partial different equations of motion from Hamiltonian.Employing the method of multiple scales,we reduce these equations into the envelope function equation and find the amplitude function satisfied a nonlinear Schrödinger equation.We get the periodic wave solution and analyse its stability antiferromagnet KCuF_(3).
基金
Supported by the National Natural Science Foundation of China.
