Surface resonance on the (63×63)-R30°-reconstructed 5 ML Au on (3×3)-R30°-4H-SiC(0 0 0 1)

In this paper we present evidence for a surface resonance on the (63×63)-R30°-reconstruction obtained on 5 monolayers (ML) of Au deposited on the (3×3)-R30°-4H-SiC(0001) and subsequently annealed. We use synchrotron radiation-based angle resolved photoelectron spectroscopy to show that this resonance has no k⊥-dispersion, but a parabolic-like k∥-dispersion of 0.4 eV around Γ. Its electronic localization in the (63×63)-R30° surface reconstruction is documented by comparison with the (23×23)-R30° structure, obtained at a slightly lower annealing temperature after 5 ML Au deposition on the (3×3)-R30°-4H-SiC(0001) substrate.