PECULIARITIES OF INTERBAND PHOTOLUMINESCENCE IN THE SEMIMAGNETIC SEMICONDUCTOR HG1-XMNXTE

The results of photoluminescence (PL) investigations of semimagnetic Hg1-xMnxTe single crystals are presented. The crystal composition range (x = 0.104, 0.167, 0.202) demonstrates the transformation of photoluminescence spectrum when the effective g-factor changes its sign. Temperature and magnetic field dependencies have shown a strong non-monotonic behaviour of edge emission feature. An extremely narrow half width (2.5 meV) is observed at B = 2.3 T for x = 0.104. The blue shift of photoluminescence maximum with increasing magnetic field is described by the modified Pidgeon-Brown model. For x = 0.167 and x = 0.202 a strong asymmetry of the photoluminescence peak is detected. Its behaviour in a magnetic field requires further corrections in the Pidgeon-Brown consideration. Some arguments for a magneto-polaron mechanism of PL temperature dependencies are presented.