Abstract
Far-infrared (FIR) magnetotransmission was investigated in a series of p-type Hg1-xMnxTe crystals (0.10<or=x<or=0.15) with excess shallow acceptor concentrations ranging from 6*1015 to 3*1016 cm-3. The FIR transmission displays a precipitous drop with increasing magnetic field. This magnetic-field-induced absorption is strongly dependent on temperature and is strongly anisotropic, i.e. for polarisation E perpendicular to B the absorption is always much higher than for E//B. The behaviour is similar to the anisotropy of DC hopping conductivity and leads the authors to the conclusion that, for energies lower than 4 meV, the observed FIR magnetoabsorption originates from optically induced hopping between neutral and ionized states. At higher photon energies, magnetotransmission in the Faraday geometry displays a striking asymmetry with respect to circular polarisation, the origin of which is not presently understood.
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