The exciton problem in wurtzite-type crystals is investigated taking into full account the structure of the valence bands. Using perturbation theory, after a proper rotation of the exciton Hamiltonian, we obtain analytical expressions for the exciton ground states originating from the Γ₉, Γ₇, and Γ₇ valence subbands. These expressions are valid for any value of the crystal field splitting. Results are given for CdSe and CdS and the agreement with experiment is good.
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N. O. Lipari (1971) studied this question.
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