I have a question regarding the spin-orbit interaction in zinc blend materials. As far as I understood, the split-off valence band (VB) forms as a result of this interaction, and it is a shift in energy that causes the formation of the split-off band.
On the other hand, spin-orbit interaction causes a splitting of spin-up and down states in the k-space in the conduction band (CB) even without an applied magnetic field.
Are these two phenomena, the band splitting in CB and VB related? Are there any recommended references? Thanks,