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

Figure 12

Total absorption coefficient as a function of the incident photon energy for several values of the electric field applied in the -direction and varying in steps of 8 kV/cm from 0 to 200 kV/cm. , , and constant dot-height of . The curves are shifted  m. 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. The green lines correspond to the calculated energy transitions from Figure 4(a).

(a)

(b)

(c)

(d)