Determination of Exciton Zeeman Splittings in Cd_1-xMn_xTe from Faraday Rotation Measurements

Abstract

Reflectivity and Faraday rotation measurements were carried out on Cd1-x Mn x Te bulk crystals in the complete zinc -blende range of composition 0 < z < 0.71. From a comparison of the results of these two experiments for samples with x < 0.3, we demonstrate that the Faraday angle θ, measured in limited spectral range, is proportional to the energy splitting of exciton states ΔΕ, measured at the same temperature (2 K) and magnetic field B (up to 5 T). The determined proportionality constant was used to calculate ΔE values also for x > 0.3. This allowed us to find an empirical description of ΔE values for the whole range of compositions as a function of B and x.

Magnetic Properties of Cd1?xMnxTe and Zn1?xMnxTe Epilayers with High Concentration of Mn

“…9 (the E g data were obtained from absorption [27,28] or reflectance [29,30] measurements). It was shown that s,p±d exchange interaction between the band carriers and Mn ions can substantially modify the band edges in the absence of the magnetic field.…”