Excitonic trion X− in GaAs quantum dots

By using the method of few-body physics, the energy spectra of low-lying states of a negatively charged exciton X− (trion) in a GaAs quantum dot with a parabolic confinement have been calculated to obtain the low-lying eigenenergy values as a function of the dot size and the electron-to-hole effective mass ratio. The dependence of the binding energy of the ground state of the trion on the quantum dot radius is obtained.