Effects Of The Band Bending And Hydrostatic Pressure On Optical Properties Of A Hydrogenic Impurity In The Spherical Quantum DOT

In the effective mass approximation, we have calculated the optical properties for the1s-2p0transitions in a hydrogenic impurity in the center of spherical quantum dot by using a triangular potential to approximate the band bending of the interface potential, under hydrostatic pressure. The linear and the third-order nonlinear optical absorption coefficients are investigated for different electron areal densitys and hydrostatic pressures. The results indicate that the peak positions of the absorption coefficients showed blue-shift with the increase of the electron areal density, and both of the linear optical absorption coefficient and the total optical absorption coefficient rises while the third-order nonlinear optical absorption coefficient reduce. Moreover, the exist of band bending weaken the quantum size effect of absorption coefficients; With the increase of the hydrostatic pressure, the peak positions of the absorption coefficients have a red-shift at first and then a blue-shift occur, the numerical value of the optical absorption coefficients also changed obviously. In brief, the band bending and hydrostatic pressure have a significant effect on the optical characteristics of this nanostructures.