title: Optimal electron doping of a C60 monolayer on Cu(111) via interface reconstruction.
abstract: We demonstrate the charge state of C60 on a Cu(111) surface can be made optimal, i.e., forming C60(3-) as required for superconductivity in bulk alkali-doped C60, purely through interface reconstruction rather than with foreign dopants. We link the origin of the C60(3-) charge state to a reconstructed interface with ordered (4x4) 7-atom vacancy holes in the surface. In contrast, C60 adsorbed on unreconstructed Cu(111) receives a much smaller amount of electrons. Our results illustrate a definitive interface effect that affects the electronic properties of molecule-electrode contact.
authors.affiliation: Center for Condensed Matter Sciences, National Taiwan University, Taipei 106, Taiwan. wpai@ntu.edu.tw
authors.forename: Woei Wu
authors.initials: WW
authors.lastname: Pai
authors.forename: H T
authors.initials: HT
authors.lastname: Jeng
authors.forename: C-M
authors.initials: CM
authors.lastname: Cheng
authors.forename: C-H
authors.initials: CH
authors.lastname: Lin
authors.forename: Xudong
authors.initials: X
authors.lastname: Xiao
authors.forename: Aidi
authors.initials: A
authors.lastname: Zhao
authors.forename: Xieqiu
authors.initials: X
authors.lastname: Zhang
authors.forename: Geng
authors.initials: G
authors.lastname: Xu
authors.forename: X Q
authors.initials: XQ
authors.lastname: Shi
authors.forename: M A
authors.initials: MA
authors.lastname: Van Hove
authors.forename: C-S
authors.initials: CS
authors.lastname: Hsue
authors.forename: K-D
authors.initials: KD
authors.lastname: Tsuei