BEAM INSTABILITY AND SPACE-CHARGE WAVE AMPLIFICATION CAUSED BY THE ELECTRON INJECTION OUT OF QW INTO 2DEG

The amplification of a space-charge wave in a two-dimensional electron gas induced by a beam instability is considered. The electron beam is regarded as being injected out of the quantum well by means of resona nt tunneling. The beam-2DEG interaction is treated in terms of the hyd rodynamic equations of a two-component liquid and the Poisson equation . Tile numerical solution of the dispersion equation is obtained, the increment of SCW is calculated and tile dependence of the increment on the frequency tending to the 2D-plasmon frequency is considered.