title: Symmetry-protected surface state on Mo(1 1 2).
abstract: We report the experimental identification of a symmetry-protected surface state on Mo(1 1 2). The utilization of photon-energy- and polarization-dependent angle-resolved photoemission spectroscopy clearly demonstrates that this true surface state preserves its two-dimensional character despite the fact that it resides within the projection of the bulk bands along the ̅Γ-̅X line of the surface Brillouin zone. This surface state on Mo(1 1 2) exists due to the forbidden hybridization between the bulk and the surface states, each of which possesses different state symmetries within the crystal. The experimental identification of such a surface state possibly opens up pathways towards controlled manipulation between true surface states and the surface resonances (i.e. between two-dimensional and quasi-two-dimensional states) by breaking the symmetry of the crystal surface.
authors.affiliation: Department of Physics and Astronomy, Jorgensen Hall, PO Box 880299, University of Nebraska-Lincoln, Lincoln, NE 68588-0299, USA. Present address: Department of Physics, Tohoku University, Aramaki-aza-Aoba, Aoba-ku, Sendai, Japan.
authors.forename: Keisuke
authors.initials: K
authors.lastname: Fukutani
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Hayashi
authors.forename: Thomas T
authors.initials: TT
authors.lastname: Scott
authors.forename: Yorito
authors.initials: Y
authors.lastname: Nagata
authors.forename: Taiki
authors.initials: T
authors.lastname: Horike
authors.forename: Jian
authors.initials: J
authors.lastname: Jiang
authors.forename: Hideaki
authors.initials: H
authors.lastname: Iwasawa
authors.forename: Kenya
authors.initials: K
authors.lastname: Shimada
authors.forename: Yaroslav B
authors.initials: YB
authors.lastname: Losovyj
authors.forename: Peter A
authors.initials: PA
authors.lastname: Dowben
mesh_terms: D003460:Crystallization; D008968:Molecular Conformation; D008982:Molybdenum / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D017785:Photons; D013499:Surface Properties
chemical_list: D008982:Molybdenum