Accession Number:

ADA255951

Title:

Final Report for Contract N00014-81-K-0430 (Illinois University)

Descriptive Note:

Final rept. 1 May 1986-30 Oct 1988

Corporate Author:

ILLINOIS UNIV AT URBANA DEPT OF PHYSICS

Report Date:

1988-10-30

Pagination or Media Count:

13.0

Abstract:

Semiconductor superlattices have drawn substantial interest in the last decade. In an effort to understand the electronic structures, we have developed some new computational methods, including the multi-band effective-mass method, the Wannier-orbital method and the bond-orbital method. We have developed a new line-shape theory for photoabsorption in superlattices. The new method allows one to accurately and efficiently calculate the photo-absorption of a realistic superlattice, including excitonic effect, valence band mixing and inter-well-coupling. We have performed detailed theoretical studies of phonon modes in semiconductor superlattices in an realistic rigid-ion model. We have calculated the dispersion curves for phonons propagating in any directions, taking into account the long-range Coulomb interactions.

Subject Categories:

  • Electrical and Electronic Equipment
  • Crystallography
  • Optics
  • Nuclear Physics and Elementary Particle Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE