Spin-orbit splitting inMgxZn1−xTealloys

The spin-orbit splitting ${\Delta }_0$ and ${\Delta }_1$ of electron energy levels at the $\Gamma$ and $\Lambda$ points are obtained for the alloys ${\mathrm{Mg}}_x{\mathrm{Zn}}_{1-x}\mathrm{Te}$ in the cubic range $x<\mathrm{}0.5\mathrm{}$ from wavelength-modulation reflectivity measurements at both $T=300\mathrm{}$ K and $T=82\mathrm{}$ K. Within experimental scattering, ${\Delta }_0$ and ${\Delta }_1$ do not depend on $x$ and $T$. These data are explained by semiempirical developments on the basis of the well-known time-sharing relation following the Berolo-Woolley analysis. An evaluation of the multiplicative factor in this relation is made for ${\Delta }_0$ by introducing the metallicities of end compounds. In addition, we give a new set of a parameters for the calculation of ${\Delta }_0$ in II-VI binary compounds from the time-sharing relation. Finally, an estimation is made of ${\Delta }_0$ and ${\Delta }_1$ for MgTe: ${\Delta }_0\sim 0.95$ eV and ${\Delta }_1\sim 0.6$ eV. The $\frac{2}{3}$ law is roughly observed for end compounds and ternary alloys.