Magneto-optical study of Li and Na acceptor bound excitons in CdTe: Fine structure and cubic crystal-field effect

We present a high-resolution optical study of Li and Na shallow-acceptor bound excitons in CdTe. Results of absorption and Zeeman-effect experiments on the photoluminescence are discussed in terms of the j-j coupling scheme in cubic symmetry. It is shown that (i) the low-lying bound-exciton states are derived from the J=2 two-hole state, and (ii) the cubic crystal-field effect is dominant over the electron-hole interaction. The magnetic parameter values are the same as those previously determined for the Cu and Ag deeper-acceptor bound excitons: $g_e$=-1.77 for the electron, K=+0.61, and L=-0.04 for the hole.