Band structure of ZnO from resonant x-ray emission spectroscopy

Soft x-ray emission and absorption spectroscopy of the OK -edge are employed to investigate the electronic structure of wurtzite ZnO(0001). A quasiparticle band structure calculated within the GW approximation agrees well with the data, most notably with the energetic location of the Zn3d-O2p hybridized state and the anisotropy of the absorption spectra. Dispersion in the band structure is mapped using the coherent k -selective part of the resonant x-ray emission spectra. We show that a more extensive mapping of the bands is possible in the case of crystalline anisotropy such as that found in ZnO.