OPTICAL AND MAGNETOOPTICAL DIFFERENTIAL SPECTROSCOPY OF A ZNCDSE-ZNSESUPERLATTICE

We report on optical and magneto-optical studies of a ZnCdSe-ZnSe stra ined layer superlattice. This structure was grown by metal-organic vap our phase epitaxy (MOVPE) and consisted of 40 periods of 72 Angstrom Z nCdSe layer and 49 Angstrom ZnSe layer with cadmium composition equal to 4%. Photoluminescence, reflectivity and magnetocircular dichroism e xperiments at 2 K were used to identify e(1)-hh(1) and e(1)-lh(1) exci tonic transitions. By comparing these experimental transitions with th e calculated ones, we have determined the valence and the conduction b and offsets. In these calculations, we have included values of the bin ding energies related to the different transitions. These binding ener gies are calculated within the formalism of fractional dimensional spa ce. Zeeman splitting of \+/-3/2, +/-1/2] and \+/-1/2, -/+ 1/2] transit ions are calculated at 5.5 T and the corresponding effective g-values g(3/2) and g(1/2) are deduced. (C) 1997 Elsevier Science S.A.