Linear and nonlinear optical properties of a modified Gaussian quantum dot: pressure, temperature and impurity effect

In this paper, the effect of pressure, temperature and impurity on the energy levels, binding energy, linear and nonlinear optical properties of a modified Gaussian quantum dot are studied. In this regard, the finite element method is employed to solve the single electron Schrodinger equation in the effective mass approximation with and without impurity at the center of the dot. In addition, the energy levels, the wave functions, biding energy, absorption coefficients and refractive index changes for different pressures and temperatures are calculated. The results show that the energy levels decrease by increasing pressure and increase by increasing the temperature for both, with and without impurity, situations. Also, in the presence of impurity, the refractive index changes are greater than the case without impurity and shift to higher energies. Furthermore, by increasing the pressure, the refractive index changes increase and shift to lower energy for both with and without impurity cases. By increasing the pressure and temperature the absorption coefficients decrease and shift to lower energy for all with and without impurity cases