Surface resonance on the -reconstructed 5 ML Au on -4H–SiC(0 0 0 1)

In this paper we present evidence for a surface resonance on the ( 6 3 × 6 3 ) – R 30 ° -reconstruction obtained on 5 monolayers (ML) of Au deposited on the ( 3 × 3 ) – R 30 ° - 4 H – SiC ( 0 0 0 1 ) 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 ( 6 3 × 6 3 ) – R 30 ° surface reconstruction is documented by comparison with the ( 2 3 × 2 3 ) – R 30 ° structure, obtained at a slightly lower annealing temperature after 5 ML Au deposition on the ( 3 × 3 ) – R 30 ° - 4 H – SiC ( 0 0 0 1 ) substrate.