Approximate calculation of electronic energy levels of axially symmetric quantum dot and quantum ring by using energy dependent effective mass

Calculations of electronic structures about the semiconductor quantum dot and the semiconductor quantum ring are presented in this paper.To reduce the calculation costs,for the quantum dot and the quantum ring,their simplified axially symmetric shapes are utilized in our analysis.The energy dependent effective mass is taken into account in solving the Schro¨dinger equations in the single band effective mass approximation.The calculated results show that the energy dependent effective mass should be considered only for relatively small volume quantum dots or small quantum rings.For large size quantum materials,both the energy dependent effective mass and the parabolic effective mass can give the same results.The energy states and the effective masses of the quantum dot and the quantum ring as a function of geometric parameters are also discussed in detail.