Surface-state band structure of the Si(100)2×1 surface studied with polarization-dependent angle-resolved photoemission on single-domain surfaces

摘要: The electronic structure of the Si(100)2\ifmmode\times\else\texttimes\fi{}1 surface has been studied with polarization-dependent angle-resolved photoemission. By using vicinal Si(100) samples, single-domain 2\ifmmode\times\else\texttimes\fi{}1 surfaces were obtained, and surface-band dispersions measured unambiguously along symmetry axes \ensuremath{\Gamma}\ifmmode\bar\else\textasciimacron\fi{}-J\ifmmode\bar\else\textasciimacron\fi{}' \ensuremath{\Gamma}\ifmmode\bar\else\textasciimacron\fi{}-J\ifmmode\bar\else\textasciimacron\fi{} in Brillouin zone (SBZ). obtained are compared to from earlier studies two-domain surfaces, as well theoretical band-structure calculations. In addition well-known state attributed dangling bonds, five more surface-related structures observed on surface. One these is controversial previously at J\ifmmode\bar\else\textasciimacron\fi{}' [010] direction \ensuremath{\sim}0.9 eV below Fermi level (${\mathit{E}}_{\mathit{F}}$), which not accounted for any calculated band Contrary a previous report, it also several points SBZ.The second additional was found disperse downwards line, minimum energy 3.4 ${\mathit{E}}_{\mathit{F}}$ J\ifmmode\bar\else\textasciimacron\fi{}'. It interpreted back-bond resonance. third seen faint peak normal emission. Finally, two other direction, one \ensuremath{\sim}-1.3 \ensuremath{\Gamma}\ifmmode\bar\else\textasciimacron\fi{} SBZ, splitting into peaks higher ${\mathbf{k}}_{\mathrm{?}}$ values. linearly polarized light source, properties states resonances determined SBZ. polarization dependence indicates mirror directions, dangling-bond having even parity both agreement predictions symmetric dimer models, resonance odd direction. Three 2\ifmmode\times\else\texttimes\fi{}1-reconstruction. Two can be explained by domains asymmetric dimers, arranged c(4\ifmmode\times\else\texttimes\fi{}2) or p(2\ifmmode\times\else\texttimes\fi{}2) periodicities.