Non-linear interaction of space charge waves in GaAs semiconductor

This report deals with the non-linear effects on space charge waves (with phase velocity equal to the electron drift velocity) in GaAs semiconductors. If an external electric field is applied, at the critical field value E_crit, the mobility changes its sign and becomes negative, as a result, there are obtained nonlinear and linear instabilities of the interactions at fields E⩾E_crit. Under these conditions, the electron velocity is a function of the electric field given by E=E₀+E˜, where E_o is the constant part and E˜ is the variable part. The simulation of the nonlinear interaction of space charge waves in the GaAs semiconductor is made considering both the Maxwell´s equations and the velocity function