Nearly-free electronlike surface resonance of a beta-Si3N4(0001)/Si(111)-8 × 8 interface

We report the discovery of a nearly-free electronlike resonant state for a ?-Si3N4(0001)-8×8 layer grown on Si(111), as observed by angle-resolved photoemission and scanning tunneling spectroscopy. Comparison with measurements performed on a Si(111)-7×7 surface helped us in the identification of the band. It is found that this parabolic state is degenerate with surface projected bulk bands of the Si(111) substrate.