Band structure of ZnO from resonant x-ray emission spectroscopy
  Soft x-ray emission and absorption spectroscopy of the O K-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. 
A. R. H. Preston, B. J. Ruck, L. F. J. Piper, A. DeMasi, K. E. Smith,   A. Schleife, F. Fuchs, F. Bechstedt, J. Chai, S. M. ...