Spin-flip acceptor scattering in ZnTe

Two transitions have been observed in ZnTe: As and in ZnTe: P. These are interpreted as the $-\frac{3}{2}\to -\frac{1}{2}$ and $-\frac{3}{2}\to +\frac{1}{2}$ transitions of holes bound to the shallow arsenic and phosphorous acceptors. The deduced bound-hole gyromagnetic ratio is similar in each case: $g_{\frac{1}{2}}=0.61\mathrm{}\pm 0.04$; $g_{\frac{3}{2}}=0.63\mathrm{}\pm 0.04$ for ZnTe: P and $g_{\frac{1}{2}}=0.37\mathrm{}\pm 0.04$ and $g_{\frac{3}{2}}=0.39\mathrm{}\pm 0.04$ for ZnTe: As. These ZnTe: P values are in excellent agreement with the shallow acceptor $g$ value $g_h=0.59\mathrm{}\pm 0.05$ obtained by Dean et al. from luminescence Zeeman studies, but both As and P values are significantly smaller than the values for free holes obtained from theory (0.92 ± 0.15, Hollis) and experiment (0.9-1.1, Hollis and Scott, spin-flip scattering; 0.89 ± 0.10, Venghaus et al., magnetoreflectivity). The difference between free- and bound-hole $g$ values is interpreted in terms of Hollis's valence-band theory for ZnTe, which shows that $g_h$ decreases with increasing wave vector near the Brillouin-zone center.