Abstract
We report the results of magneto-optical experiments on two Cd 1− x Mn x Te/Cd 1− y Mg y Te modulation-doped single quantum well (QW) structures, with x=0.005, y=0.2 and electron sheet concentrations n=2.9 and 5.65×10 11 cm −2 . Experiments have been performed in magnetic fields up to 23 T and at low temperatures down to 75 mK. The results obtained in the range of low magnetic fields (B<2 T) and at temperatures 1 K<T<4.2 K are relatively well understood in terms of a standard mean-field approach adapted for a 2D electronic system coupled to the magnetic environment. Pronounced deviations from the isolated paramagnetic Mn 2+ behaviour are observed when lowering the temperature in the low-field limit as well as striking anomalies in the range of high magnetic fields in the vicinities of integer filling factors.
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