title: Experimental and theoretical evidence of a highly ordered two-dimensional Sn/Ag alloy on Si111.
abstract: The existence of a highly ordered, two-dimensional, Sn/Ag alloy on Si(111) is reported in this study. We present detailed atomic and electronic structures of the one atomic layer thick alloy, exhibiting a 2 × 2 periodicity. The electronic structure is metallic due to a free-electron-like surface band dispersing across the Fermi level. By electron doping, the electronic structure can be converted into a semiconducting state. A rotated Sn trimer constitutes the key structural element that could be identified by a detailed analysis of constant energy contours derived from the free-electron-like band.
authors.affiliation: Department of Physics, Chemistry, and Biology, Linköping University, Sweden.
authors.forename: Jacek R
authors.initials: JR
authors.lastname: Osiecki
authors.forename: H M
authors.initials: HM
authors.lastname: Sohail
authors.forename: P E J
authors.initials: PE
authors.lastname: Eriksson
authors.forename: R I G
authors.initials: RI
authors.lastname: Uhrberg