Surface electronic structure of K- and Cs-induced √21×√21 phases on Ag∕Si(111)√3×√3
2004 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 70, no 24, 245301- p.Article in journal (Refereed) Published
A √21×√21 reconstruction has been formed by adding either K or Cs atoms on the Ag∕Si(111)√3×√3 surface at 120 K. The electronic structures of these surfaces have been studied by angle-resolved valence band and core-level spectroscopy. In similarity with Ag or Au adatoms, the presence of K or Cs adatoms on Ag∕Si(111)√3×√3 results in a metallic √21×√21 surface. The formation of two surface bands near the Fermi level can be explained by band folding of a partially occupied surface band originating from the underlying Ag∕Si(111)√3×√3 surface. A detailed analysis of the Si 2p core-level spectra of the above surfaces is presented and compared to the Ag∕Si(111)√3×√3 surface. In the case of Ag∕Si(111)√3×√3, we find that the metallic tail of the Si 2p spectra is related to extra Ag. Both the valence band and the Si 2p spectra of the Ag∕Si(111)√3×√3 surface show that the surface is semiconducting after annealing at ∼600°C.
Place, publisher, year, edition, pages
2004. Vol. 70, no 24, 245301- p.
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-45575DOI: 10.1103/PhysRevB.70.245301ISI: 000226112300059OAI: oai:DiVA.org:liu-45575DiVA: diva2:266471