Valence band structure of the Si(331)-(12 × 1) surface reconstruction

Using angle-resolved photoelectron spectroscopy we investigate the electronic valence band structure of the Si(331)-(12 × 1) surface reconstruction for which we recently proposed a structural model containing silicon pentamers as elementary structural building blocks. We find that this surface, reported to be metallic in a previous study, shows a clear band gap at the Fermi energy, indicating semiconducting behavior. An occupied surface state, presumably containing several spectral components, is found centered at −0.6 eV exhibiting a flat energy dispersion. These results are confirmed by scanning tunneling spectroscopy and are consistent with recent first-principles calculations for our structural model.


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JOURNAL OF PHYSICS: CONDENSED MATTER, 23, 135003
Year:
2011
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IMT-NE Number: 600
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 Record created 2011-03-15, last modified 2018-03-17

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