Electroreflectance Study of Cd_xHg_1−xTe

Abstract

The electroreflectance of Cd_xHg_1−xTe alloys for x from 0 to 0.70 and for x=0.97 and x=1 was measured by the electrolyte technique in the range of photon energy 0.5 to 6 eV at room temperature. The E₀+Δ₀, E₁, E₁+Δ₁ and E₀′ transitions were investigated as a function of alloy composition. The transition energies at critical points show quadratic dependence on the alloy composition. The deviations from linearity are interpreted by using the dielectric two band method. The spin-orbit splitting Δ₀ at k=0 for HgTe was measured directly as 1.08±0.02 eV at room temperature.