Effects of the hydrostatic pressure and temperature on optical properties of a hydrogenic impurity in the disc-shaped quantum dot

The combined effects of hydrostatic pressure and temperature on the optical absorption coefficient and refractive index changes of a hydrogenic impurity in a disc-shaped quantum dot with parabolic confinement in the presence of an external electric field have been investigated by using the perturbation method within the effective-mass approximation. Analytical expressions for the linear and third-order nonlinear absorption coefficients and refractive index changes have been obtained by using the compact-density matrix formalism. We discussed the linear, third-order nonlinear, total absorption coefficients and refractive index changes as functions of photon energy, relaxation time, pressure, and temperature with I1⁄41.5 10 W/cm, F1⁄450 kV/cm, and ‘o0 1⁄4 50 meV. Our results show that the pressure and temperature play an important role in the optical absorption coefficients and refractive index changes in a disc-shaped quantum dot. & 2011 Elsevier B.V. All rights reserved.