Spin‐Orbit Splitting of the Valence Band of Wurtzite Type Crystals

A 12×12 representation is given of the valence band Hamiltonian at k = 0 which includes the spin‐orbit interaction. Expressions are derived for the energies and the linear combinations of the wave functions for the Γ 7 , Γ 8 , and Γ 9 subbands. The whole valence band is completely determined by eight parameters: three energies, two parameters coupling states of equal spin, and three parameters coupling states of opposite spin. In principle, all parameters can be obtained experimentally from the energy separations and oscillator strengths for interband transitions for polarization ⟂ c and ∥ c . Anisotropic spin‐orbit interaction and mixing of states originating from the two anions per unit cell are discussed.