THE STATIC AND DYNAMIC SCREENING OF POWER LOSS OF A 2-DIMENSIONAL ELECTRON-GAS

Experimental results concerning the well-width dependence of the acous tic-phonon-assisted energy relaxation of a two-dimensional electron ga s in GaAs/Ga1-xAlxAs quantum-well structures are compared with theoret ical models that involve piezoelectric and deformation-potential scatt ering and the effects of static and dynamic screening of the electron- acoustic phonon interaction. It is shown that screening only slightly modifies I:he predictions of the approximate calculations. (C) 1998 Ac ademic Press.