Abstract
We have investigated the two-domain (2×1)-reconstructed 3C-SiC(0 0 1) surface using angle-resolved inverse photoemission. An unoccupied surface state band at E SS=2.0 eV with respect to the valence band maximum (VBM) at the Γ point is completely located within the bulk band gap. Further, an unoccupied surface resonance at E SR=3.6 eV above VBM is observed. Both surface structures show no dispersion in Γ J and Γ J ′ directions, respectively. The energetic position of both is in good agreement with LDA surface band structure calculations. However, LDA calculations predict a dispersion of about 0.8–1.0 eV for the surface state band and about 0.5–0.8 eV for the surface resonance band, while experimentally no dispersion in Γ J and Γ J ′ directions is observed.
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