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We studied the circular polarization and angular dependences of themagneto-photoluminescence spectra of the free A-exciton 1S state in wurtziteZnO at T = 5 K. The circular polarization properties of the spectra clearlyindicate that the top valence band has Gamma_7 symmetry. The out-of-planecomponent of the magnetic field, which is parallel to the sample's c axis,leads to linear Zeeman splitting of both the dipole-allowed Gamma_5 excitonstate and the weakly allowed Gamma_1/Gamma_2 exciton states. The in-planefield, which is perpendicular to the c axis, increases the oscillator strengthof the weak Gamma_1/Gamma_2 states by forming a mixed exciton state.

Unambiguous symmetry assignment for the top valence band of ZnO by magneto-optical studies of the free A-exciton state