The Valence Band Structure of Tellurium. II. The Infrared Absorption

Abstract

The line shape is calculated for the infrared absorption spectrum corresponding to the transition between the upper and lower valence bands of tellurium. It is shown that the overall features of the calculated line shape and the temperature and concentration dependences of the spectrum are in fair agreement with experiments. From the assignments of the observed sharp peak and broad band, the magnitudes of the k-linear term S, of the spin-orbit splitting 4|Δ₁| and of the binding energy of the acceptor state Δε are determined to be 2.67×10⁻⁸ eV·cm, 128.6 meV and 0.2 meV, respectively. To our knowledge, this value of S is the biggest among those reported so far for semiconductors.