THE EFFECT OF THE ELECTRON-LONGITUDINAL OPTICAL PHONONS INTERACTION ON THE PHOTOIONIZATION IN A QUANTUM-WELL

Using variational technique, we have calculated the photon energy depe ndence of the photoionization cross-section and the binding energy of a hydrogenic donor impurity in infinite-barrier quantum well (QW) as a function of well width, taking into account the interaction between e lectron and bulk longitudinal-optical (LO) phonons. The initial ground state and the final subband state wave functions are described, respe ctively, within the framework of the strong coupling treatment of the polaron theory and in;the Lee-Low-Pines approximation. The results ind icate that the effects of the electron-LO phonon coupling on the bindi ng energy and the spectral dependence of the cross-section are very si gnificant. (C) 1998 Elsevier Science Ltd. All rights reserved.