Binding Energies of Impurity States and Photoionization Cross Sections in Ellipsoidal Inverted Core/Shell Quantum Dots
Under the effective mass approximation,the impurity state binding energy and photoi-onization cross section in ellipsoidal inverted core/shell quantum dots with the core as potential barrier and the shell as potential well as functions of the system size,ellipticity,and position of the impurity have been studied.Numerical calculations show that the size and shape of the quantum dots have important effects on the binding energy and photoionization cross section.The binding energy and photoionization cross section vary non-monotonically with the quantum dot size,the influence of ellipticity is obvious when the shell thickness is small,and the binding energy increases with the increasing ellipticity.The peak intensity of the photoionization cross section increases with the increasing core size at different impurity positions and ellipticities,and the peak position appears the redshift or blueshift.
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