Abstract
The present paper is concerned with an experimental study of Faraday rotation in a Cd 0.89 Mn 0.11 Te/Cd 0.61 Zn 0.39 Te superlattice at 300 K and 4.2 K. As the width of Cd 0.89 Mn 0.11 Te well decreases, a lying-S shaped dispersion of the Faraday rotation spectrum, which is consistent with a predominant exciton transition of | 3/2, ±3/2> to | 1/2, ± 1/2>, shifts toward a higher photon energy, and the peak value of the dispersion spectrum becomes larger than that for the Cd 0.89 Mn 0.11 Te thin film. In the superlattice systems, we also observed a Faraday rotation spectrum consistent with the exciton transition of | 3/2, ±1/2> to | 1/2, ±1/2> at a higher photon energy. The shift of the energy-band gap due to the lattice-mismatch is calculated for this system on the basis of the model of free standing strained superlattice. The positions of calculated energy in the dispersion spectrum are in good agreement with experimental results.
Published Version
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