title: Confinement of surface state electrons on Cu and Au field emitters.
abstract: Field-emission images of clean Cu and Au emitters show a peculiar halo-like ring centered at the [1 1 1] pole. Typical diameter and width of the ring are approximately 10 nm and approximately 2 nm, respectively. Since we found no geometrical features around the [1 1 1] pole that gives rise to such a ring pattern, we interpreted the ring pattern as representing enhanced emission from an annular terrace that resonantly confines surface electrons. A simple analysis shows that the observed ring pattern appears at a terrace whose width nearly matches the confinement condition.
authors.affiliation: Department of Integrated Arts and Sciences, University of Osaka Prefecture, Japan. sakai@mesostm.mtl.kyoto-u.ac.jp
authors.forename: T
authors.initials: T
authors.lastname: Sakata
authors.forename: H
authors.initials: H
authors.lastname: Fujioka
authors.forename: A
authors.initials: A
authors.lastname: Sakai