Spin-Orbit Splitting at theΓPoint inZnSexTe1−xAlloys

Abstract

Electroreflectance spectra were measured at room temperature to determine the energies of the lowest gap, $E_0$, and its spin-orbit-splitting gap, $E_0+{\Delta }_0$, in $\mathrm{Zn}{\mathrm{Se}}_x{\mathrm{Te}}_{1-x}$ alloys as a function of composition $x$. The variation with $x$ of the spin-orbit splitting at the $\gamma$ point, ${\Delta }_0$, was found to show convex behavior, confirming our preliminary results deduced from reflectivity measurements. The deviation from linearity of ${\Delta }_0$ is 0.146 eV at $X=0.5\mathrm{}$. The bowing parameters of the $E_0$ and $E_0+{\Delta }_0$ gaps were determined to be 1.266 ± 0.023 and 0.681 ± 0.040 eV, respectively.