Comprehensive study of the metal/semiconductor character of adatom-induced Ag/Si(111) reconstructions
2001 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 64, no 24Article in journal (Refereed) Published
A √21×√21 reconstruction can be formed by either Ag or Au adsorption on the Ag/Si(111) √3×√3 surface. The electronic structures determined by angle-resolved photoemission from these two √21×√21 surfaces show clear similarities. The presence of the extra Ag or Au adatoms results in a metallic surface with two surface state bands near the Fermi level. Only one of these bands crosses the Fermi level instead of two as reported in the literature. A tiny amount of Ag deposited onto the √21×√21-Ag surface below 100 K transforms it into a 6×6 periodicity. The additional Ag leads to an interesting transition from the metallic √21×√21 surface to a semiconducting 6×6 surface with a gap of about 0.2 eV with respect to the Fermi level.
Place, publisher, year, edition, pages
2001. Vol. 64, no 24
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-47913DOI: 10.1103/PhysRevB.64.245421ISI: 000173082500115OAI: oai:DiVA.org:liu-47913DiVA: diva2:268809