Abstract
B, C associated with split valence bands of Γ9, Γ7 and Γ, symmetries using a spherically symmet- ric approximation for the standard effective-mass Hamiltonian. The exci- tonic equations are solved within the subspace of optically active states of s-symmetry. The effects of crystal field and spin-orbit coupling are discussed. The results show that the spherical approximation is in perfect agreement with experimental findings.
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