Comment on ‘‘g-factor anisotropy of conduction electrons in InSb’’

In a recent article by Chen et al. [Phys. Rev. B 31, 7989 (1985)] a careful analysis of the spin splitting of the conduction electrons in InSb and its anisotropy is performed. As a result, it is possible to separate the contribution to the g factor of the conduction electrons due to the spin-orbit splitting of the ${\Gamma }_{15v}$ valence band ($g_{\mathrm{PB}}$) from other contributions (4$N_1$). The latter are usually attributed to the spin splitting of the ${\Gamma }_{15}$ conduction band. We show here that the contribution of the spin-orbit splitting of the ${\Gamma }_{15c}$ conduction band is one order of magnitude smaller than needed to explain $N_1$. Instead, we propose that spin-orbit coupling between ${\Gamma }_{15v}$ and ${\Gamma }_{15c}$ accounts quantitatively for the observed value of $N_1$.