Abstract
The symmetry of excitons in ZnO was comparatively studied with GaN by using magnetoreflectivity measurements. The magnetic field perpendicular to the c-axis leads to prominent additional peaks, which were assigned to forbidden exciton states at zero field. In addition, the collapse of the exciton symmetry observed by using time-resolved dierential reflectivity spectroscopy was briefly introduced in a facet excitation geometry of strain-free bulk GaN. With a proper choice of polarization configuration between the pump and the probe, we find that ultrafast symmetry breaking of excitons during the energy relaxation from the J = 1/2 to the J = 3/2 states proceeds via an angular momentum flip or a spin flip.
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