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


Personal Author(s) : Chang, Yia-Chung ; Ren, S -F ; Cancio, A ; Perakis, I


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a255951.pdf


Report Date : 30 Oct 1988


Pagination or Media Count : 13


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.


Descriptors :   *SUPERLATTICES , *SEMICONDUCTORS , ELECTRONICS , OPTICAL PROPERTIES , POLARIZATION , LIQUIDS , ALLOYS , ELECTRICAL PROPERTIES , SPECTRA , INDIUM PHOSPHIDES , ABSORPTION , PHONONS , ALUMINUM ARSENIDES , TRANSITIONS , VALENCE , QUANTUM ELECTRONICS , ELECTRONS , MONTE CARLO METHOD , NONLINEAR OPTICS , ORDER DISORDER TRANSFORMATIONS , GALLIUM ARSENIDES , ALUMINUM GALLIUM ARSENIDES , ELECTRON SCATTERING


Subject Categories : Electrical and Electronic Equipment
      Crystallography
      Optics
      Nuclear Physics & Elementary Particle Physics


Distribution Statement : APPROVED FOR PUBLIC RELEASE