Donor Impurity-Related Optical Absorption in GaAs Elliptic-Shaped Quantum Dots

Figure 13

Total absorption coefficient as a function of the incident photon energy for several values of the horizontal length varying in steps of from to . The curves are shifted  . The height of the dot is given by with symmetric finite confinement potentials along the -direction. Calculations are for and . In (a) and (b) the results are without donor impurity whereas in (c) and (d) they are for on-center impurity. Two values of temperature have been considered as indicated in the figures.

(a)

(b)

(c)

(d)