Kerry L. Shaklee

Electroreflectance and band structure of gray tin

Abstract The electroreflectance spectrum of gray tin in the 1–5 eV region is reported. Nine peaks are observed and assigned to direct interband transitions at critical points. A semiempirical band structure, calculated with due regard of spin-orbit interaction by the k . p . method, incorporating the electroreflectance gaps and the Groves-Paul model is presented.

Derivative spectrum of indirect excitons in AlSb

Abstract Structure due to phonon-assisted exciton transitions has been observed in AlSb at 77°K using a double-beam wavelength modulation spectrometer. The exciton energy gap and the energies of the TA, LA, and LO Phonons at the X-point of the Brillouin zone have been determined. These results are consistent with the valence and conduction band extrema having Γ 15 and X 1 symmetries respectively. The systematics of the phonon energies at the X point of zinc-blende-type materials is discussed.