Linear and nonlinear optical properties of a single dopant in strained AlAs/GaAs spherical core/shell quantum dots

The hydrostatic pressure influence on the binding energy and on the optical properties (linear and third nonlinear) associated to the 1s−1p intersubband transition of single dopant in a AlAs/GaAs spherical core/shell structure is investigated. The combined effects of the problem variables such as the core and shell sizes, the donor position in the structure and the pressure dependence of the physical parameters of the material have been analyzed. Our calculations are performed in the framework of the effective mass approximation and the energies are obtained by using a variational method. The results show that the linear and nonlinear parts of the absorption coefficient and the refractive index associated to the intersubband 1s−1p transition undergo important changes. There are several interesting results to point out such as the shift of the absorption coefficients and refractive index to high values of photon energy. Another significant result is that the donor position considerably affects the optical properties and their corresponding amplitude.