Binding energy of donor states in a GaAs quantum dot: effect of electric and magnetic field

Using the potential morphing method, the effects of electric or magnetic field on the binding energy of the hydrogenic impurity in disc-like GaAs quantum dots with parabolic confinement have been studied in details. Our results indicate that the binding energy of impurities decreases as the electric field increases. Moreover the relative reduction of the binding energy decreases as the strength of the confining potential decreases. Finally the magnetic field investigations have shown that the binding energy increases as the applied magnetic field increases.