Effect of impurity on the absorption of a parabolic quantum dot with including Rashba spin–orbit interaction

• Calculations of energy states of parabolic disk-like quantum dot.
• The study of the influence of impurity parameters on the absorption coefficients.
• Study of the dependence of the absorption coefficients on the impurity position.
• The absorption coefficient has strong dependency on the impurity parameters.

In this paper, the influence of impurity parameters on the electron energy spectrum and absorption coefficients in a parabolic quantum dot and in the presence of Rashba spin–orbit interaction subjected to a perpendicular magnetic field is studied. The impurity potential is approximated by a Gaussian form. We have shown that in the both cases of a repulsive and attractive Gaussian impurity, the absorption coefficients are strongly affected by the decay length. These coefficients show blue (red) shift as the decay length of repulsive (attractive) impurity is increased. The dependence of the absorption coefficients on the impurity position is also examined for different polarizations. Our results show that the absorption coefficient has local maximum (minimum) for a given value of impurity position for Y-polarized (X-polarized) light.

Dependence of the linear and total absorption coefficients (ACs) of a doped QD with repulsive impurity on the incident photon energy and different distance of impurity from the dot center (x0) for the case of X-polarized light.Figure optionsDownload as PowerPoint slide