Calculations of the Nonlinear Acoustoelectric Current in A Doping Superlattice Gaas:si/gaas:be in the Presence of an Electromagnetic Wave

The nonlinear acoustoelectric (NAE) current in a doping superlattice (DSL) is investigated for an acoustic wave in the region ql>>1 (where q is the acoustic wave number) in the presence of an electromagnetic wave. The dependence of the NAE current jNAE on the frequency of external acoustic wave q, the temperature T, the amplitude E0 and frequency of the electromagnetic wave are obtained by using the quantum kinetic equation for electron-external acoustic wave interaction and electron-acoustic phonon (internal acoustic wave) scattering. Numerical calculation is done, and the result is discussed for a typical GaAs:Si/GaAs:Be DSL. The computational results show that the dependence of the NAE current jNAE on the external acoustic wave frequency q, the frequency of electromagnetic wave and the characteristic parameters of DSL is non-monotonic andthe cause of appearance peaks attributes the transition between mini-bands. The quantum theory of the NAE current in a GaAs:Si/GaAs:Be DSL is newly developed