Impurity-related photoionization cross section in a pyramid-shaped quantum dot: Intense laser field and hydrostatic pressure effects

Within the effective mass approximation the binding energy and photoionization cross section of a donor impurity in a pyramid shaped quantum dot under simultaneous action of the hydrostatic pressure and high-frequency laser field have been investigated. We found that: (i) the variation of the binding energy reflects the spatial distribution of the impurity wave function, which is significantly modified by the laser radiation; (ii) the photoionization cross section and resonant peak magnitude depend on the donor position, laser field intensity and pressure. The localization of resonant peak maxima in the doping planes and their dependence on external perturbations are systematically investigated.