title: Fractional band filling in an atomic chain structure.
abstract: A new chain structure of Au is found on stepped Si(111) which exhibits a 1/4-filled band and a pair of > or =1/2-filled bands with a combined filling of 4/3. Band dispersions and Fermi surfaces for Si(553)-Au are obtained by photoemission and compared to that of Si(557)-Au. The dimensionality of both systems is determined using a tight binding fit. The fractional band filling makes it possible to preserve metallicity in the presence of strong correlations.
authors.affiliation: Department of Physics, UW-Madison, 1150 University Avenue, Madison, Wisconsin 53706, USA.
authors.forename: J N
authors.initials: JN
authors.lastname: Crain
authors.forename: A
authors.initials: A
authors.lastname: Kirakosian
authors.forename: K N
authors.initials: KN
authors.lastname: Altmann
authors.forename: C
authors.initials: C
authors.lastname: Bromberger
authors.forename: S C
authors.initials: SC
authors.lastname: Erwin
authors.forename: J L
authors.initials: JL
authors.lastname: McChesney
authors.forename: J-L
authors.initials: JL
authors.lastname: Lin
authors.forename: F J
authors.initials: FJ
authors.lastname: Himpsel