title: Indium square root 7 x square root 3 on Si(111): a nearly free electron metal in two dimensions.
abstract: We present measurements of the Fermi surface and underlying band structure of a single layer of indium on Si(111) with square root 7 x square root 3 periodicity. Electrons from both indium valence electrons and silicon dangling bonds contribute to a nearly free, two-dimensional metal on a pseudo-4-fold lattice, which is almost completely decoupled at the Fermi level from the underlying hexagonal silicon lattice. The mean free path inferred from our data is quite long, suggesting the system might be a suitable model for studying the ground state of two-dimensional metals.
authors.affiliation: MS 6-2100, Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors.forename: Eli
authors.initials: E
authors.lastname: Rotenberg
authors.forename: H
authors.initials: H
authors.lastname: Koh
authors.forename: K
authors.initials: K
authors.lastname: Rossnagel
authors.forename: H W
authors.initials: HW
authors.lastname: Yeom
authors.forename: J
authors.initials: J
authors.lastname: Schäfer
authors.forename: B
authors.initials: B
authors.lastname: Krenzer
authors.forename: M P
authors.initials: MP
authors.lastname: Rocha
authors.forename: S D
authors.initials: SD
authors.lastname: Kevan