The soliton properties of dipole domains in superlattices

The formation and propagation of dipole domains in superlattices are studied both by the modified discrete drift model and by the nonlinear Schr?dinger equation. The spatiotemporal distribution of the electric field and electron density are presented. The numerical results are compared with the soliton solutions of the nonlinear Schr?dinger equation and analysed. It is shown that the numerical solutions agree with the soliton solutions of the nonlinear Schr?dinger equation. The dipole electric-field domains in semiconductor superlattices have the properties of solitons.