Abstract
Low-field electroreflectance (ER) and wavelength-modulated reflectivity (WMR) spectra have been obtained on Zn1−x Mnx Se single crystals in the whole range of composition, 0≤x≤0.57. An analysis of the ER data enabled us to determine the dependence of the fundamental energy gap on temperature (8 K≤T≤300 K) and Mn molar fraction x. In samples with x≥0.35, which crystallize in a wurtzite structure, two or three temperature-dependent features are observed in WMR spectra and in some ER spectra. We identify these peaks with the ground-state excitons for different valence bands in hexagonal Zn1−x Mnx Se. The observed crystal-field splitting is ∼20 meV for x=0.39 and decreases with increasing Mn content.
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