Unambiguous symmetry assignment for the top valence band of ZnO by magneto-optical studies of the free A-exciton state
Abstract
We studied the circular polarization and angular dependences of the magneto-photoluminescence spectra of the free A-exciton 1S state in wurtzite ZnO at T = 5 K. The circular polarization properties of the spectra clearly indicate that the top valence band has Gamma7 symmetry. The out-of-plane component of the magnetic field, which is parallel to the sample's c axis, leads to linear Zeeman splitting of both the dipole-allowed Gamma5 exciton state and the weakly allowed Gamma1/Gamma2 exciton states. The in-plane field, which is perpendicular to the c axis, increases the oscillator strength of the weak Gamma1/Gamma2 states by forming a mixed exciton state.
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