Observation of a series of surface excitons in ZnO associated with intrinsic two-dimensional surface subbands
Panosyan Zh. R., Kasamanyan Z. A., Mailyan A. R.
The reflection spectra of ZnO single crystals reveal a series of lines due to surface excitons. The number and energies of these lines vary with the height of the surface potential and the distance over which it decays. The surface excitons observed are related to intrinsic two-dimensional surface subbands.