A first-principles calculation of the far-infrared conductivity of electron-hole systems is presented. Anisotropy, i.e., ellipsoidal energy surface, is included and the effect of interband transition is dropped. The results can be directly applied to droplets in $〈111〉$ strained germanium.

• Received 21 March 1980

DOI:https://doi.org/10.1103/PhysRevB.22.3897