Effect of the Incident Light Polarization and Gaussian Impurity Parameters on the Second Harmonic Generation of Quantum Dot

The influence of impurity parameters as well as the type of incident light polarization at the disk-like quantum dot with including the Rashba spin-orbit coupling on the second harmonic generation are studied. The impurity potential is assumed to be Gaussian and its effective parameters are: potential strength, decay length, impurity type and its location at the quantum dot. The calculations are performed in the framework of the effective mass approximation. The results showed that the presence of impurity leads to changes in the second harmonic generation, and the value of the second harmonic generation can be controlled by changing the impurity parameters. For example, in both types of the impurities, by increasing the impurity distance from dot center, the maximum value of this coefficient shifts to higher energies. The role of light polarization in this coefficient is also investigated and it was shown that the type of light polarization has no effect on the peak position of the second harmonic generation and only affects its peak value.