Binding energy and photoionization cross section of hydrogenic impurities in elliptic cylindrical core/shell quantum dots under a non-axial electric field

Abstract

In this study, a donor impurity confined in an elliptic cylindrical core/shell quantum dot (ECCSQD) under a non-axial electric field is studied by using a variational and perturbation approach. We have investigated the binding energy and corresponding photoionization cross section (PCS) variation with the core and shell sizes, ellipticity constant, impurity position under the non-axial electric field. The results show that the binding energy with elliptic cylinder shape is lower than that with cylinder shape. The influence of electric field in different directions on the binding energy with different impurity positions is completely different. Even though for the on-center impurity, the influence is also very different due to the elliptic cylinder shape. The PCS for the incident radiation propagates perpendicular or parallel to the axis of the ECCSQD are both considered. The results show that the PCS in both causes completely depends on the direction of non-axial electric field and impurity position. In addition, the elliptic cylinder shape also has a significant influence on the peak intensity and position of PCS. • The elliptic cylindrical QD and non-axial electric field are both considered. • Binding energy with elliptic cylinder is lower than that with cylinder. • The PCS for perpendicular or parallel to the axis of the QD are both considered. • The PCS in both causes completely depends on the direction of electric field. • QD shape has a significant influence on the peak intensity and position of PCS.