Magnetooptical Investigation of Hg_1−<i>x</i>Cd_<i>x</i>Te Mixed Crystals. I. Semimetallic Configuration

Abstract

Abstract Submillimeter resonance spectroscopy and interband magneto‐absorption are applied to the investigation of the Hg 1 − x Cd x Te alloys system in the range of composition x &lt; 0.3. Magneto‐transmission measurements are performed at 4.2 K up to 60 kG in both the spectral regions (ħω &lt; 16 meV and ħω &gt; 120 meV), on identical unoriented samples, in the Faraday and Voigt geometries. Magnetooptical data are analyzed using the virtual crystal approximation. All interband and intraband magnetooptical transitions are interpreted in terms of Γ 6 and Γ 8 Landau levels described by the Pidgeon and Brown model. The Kane matrix element, the interaction gap, and the Luttinger parameters are determined for each alloy composition from the comparison between theory and experiments. Magnetooptics also provide information on the evolution of the resonant acceptor states with the composition.