Excited states of acceptors in CdTe and ZnTe

Abstract

Higher excited states of acceptors in CdTe and ZnTe are obtained by using the Baldereschi and Lipari spherical model including the cubic correction and the central-cell effect. This is done by solving the coupled radial equations by the finite-element method with Arnoldi's algorithm, which gives several (≅20) low-lying states simultaneously. Our procedure allows one to determine very accurately the host band-structure parameters. In the case of CdTe we obtain the Luttinger parameters γ 1 = 5.30, γ 2 = 1.62, γ 3 = 2.10 and the dielectric constant ϵ 0 = 9.3. For ZnTe we obtain γ 1 = 3.80, γ 2 = 0.86, γ 3 = 1.32 and ϵ 0 = 9.4.