title: Electron-Beam Mapping of Vibrational Modes with Nanometer Spatial Resolution.
abstract: We demonstrate that a focused beam of high-energy electrons can be used to map the vibrational modes of a material with a spatial resolution of the order of one nanometer. Our demonstration is performed on boron nitride, a polar dielectric which gives rise to both localized and delocalized electron-vibrational scattering, either of which can be selected in our off-axial experimental geometry. Our experimental results are well supported by our calculations, and should reconcile current controversy regarding the spatial resolution achievable in vibrational mapping with focused electron beams.
authors.affiliation: Department of Physics, Arizona State University, Tempe, Arizona 85287, USA.
authors.forename: C
authors.initials: C
authors.lastname: Dwyer
authors.affiliation: LeRoy Eyring Center for Solid State Science, Arizona State University, Tempe, Arizona 85287, USA.
authors.forename: T
authors.initials: T
authors.lastname: Aoki
authors.affiliation: Department of Physics, Arizona State University, Tempe, Arizona 85287, USA.
authors.forename: P
authors.initials: P
authors.lastname: Rez
authors.affiliation: LeRoy Eyring Center for Solid State Science, Arizona State University, Tempe, Arizona 85287, USA.
authors.forename: S L Y
authors.initials: SL
authors.lastname: Chang
authors.affiliation: Nion Company, 11511 NE 118th Street, Kirkland, Washington 98034, USA.
authors.forename: T C
authors.initials: TC
authors.lastname: Lovejoy
authors.affiliation: Department of Physics, Arizona State University, Tempe, Arizona 85287, USA.|Nion Company, 11511 NE 118th Street, Kirkland, Washington 98034, USA.
authors.forename: O L
authors.initials: OL
authors.lastname: Krivanek