Far Infrared Magnetooptical Effects in HgTe

Abstract

Magnetic energy levels and impurity states near the Γ₈ band edge of HgTe have been investigated by a far infrared magnetooptical method (3 meV≤hω≤14 meV, H≤60 kG) at liquid helium temperatures. The transitions between the magnetic levels of Γ₈ and those associated with impurity levels are observed. The results are analysed with taking into account the ‘quantum effects’. The Luttinger parameters determined are γ₁=−14.8, γ₂=−9.0, γ₃=−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.