THE EFFECT OF THE ELECTRON-LONGITUDINAL OPTICAL PHONON INTERACTION ONTHE PHOTOIONIZATION IN QUANTUM-WELL WIRES

The photon energy dependence of the photoionization cross-section is c alculated for shallow donors in infinite potential quantum well wires with rectangular cross-sections as a function of the size of the wire. The electron-longitudinal optical (LO) phonon interaction is taken in to account using the strong coupling treatment for the impurity state and the Lee-Low-Pines variational treatment for the subband final stat e. The results we obtained show that the photoionization cross-section and the optical photoionization threshold energy are dramatically dep endent on the sizes of the wire and are very sensitive to the electron -LO phonon coupling.