Far Infrared Magnetooptical Effects in HgTe

Magnetic energy levels and impurity states near \(₈\) band edge of HgTe have been investigated by a far infrared magnetooptical method (3 meV\({≤}ω{≤}14\) meV, H ≤60 kG) at liquid helium temperatures. The transitions between the magnetic levels of \(₈\) and those associated with impurity levels are observed. The results are analysed with taking into account the `quantum effects'. The Luttinger parameters determined are γ 1 =-14.8, γ 2 =-9.0, γ 3 =-8.2 and κ=-10.2. Two impurity levels are identified; one is an acceptor level which would be degenerate with the conduction band at zero magnetic field, the other is a donor level induced by the magnetic field. The binding energy of these levels are discussed taking into account the screening anomaly.