title: Strong lateral electron coupling of pb nanowires on stepped si(111): angle-resolved photoemission studies.
abstract: We employ angle-resolved photoemission to characterize the electronic band structure of the Pb "nanowire" array self-assembled on a stepped Si(111) surface. Despite the highly oriented nanowires observed in scanning tunneling microscopy images, we find essentially two-dimensional Fermi contours modulated one dimensionally perpendicular to the wires. This strong two-dimensional and quasi-one-dimensional nature of the band structure explains the stability and anisotropy of the metallic phase down to 4 K as reported recently. A simple tight-binding model with each Si nanoterrace covered by a densely packed Pb overlayer successfully reproduces this modulated band structure and quantifies the electron coupling within the "nanostripes" and the step-edge potential.
authors.affiliation: Institute of Physics and Applied Physics and Center for Atomic Wires and Layers, Yonsei University, Seoul, Korea.
authors.forename: Keun Su
authors.initials: KS
authors.lastname: Kim
authors.forename: Harumo
authors.initials: H
authors.lastname: Morikawa
authors.forename: Won Hoon
authors.initials: WH
authors.lastname: Choi
authors.forename: Han Woong
authors.initials: HW
authors.lastname: Yeom