title: Electronic structure study of ultrathin Ag(111) films modified by a Si(111) substrate and √3 × √3-Ag2Bi surface.
abstract: Angle-resolved photoemission spectroscopy experiments show that the electronic structure of a Ag(111) film grown on Si(111) is markedly perturbed by the formation of a √3 × √3-Ag(2)Bi Rashba-type surface alloy. Four spin-split surface states, with different band dispersions and energy contours, intercept and hybridize selectively with the sp-derived quantum well states of the Ag layer. Detailed two-dimensional band mapping of the system was carried out and constant energy contours at different energies result in hexagonal-, star- and flower-like distortions of the quantum well states as a result of various interactions. Further wavy-like modulations of the electronic structure of the film are found to originate from umklapp reflections of the Ag film states according to the surface periodicity.
authors.affiliation: Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Chiba 277-8581, Japan. m-ogawa@issp.u-tokyo.ac.jp
authors.forename: M
authors.initials: M
authors.lastname: Ogawa
authors.forename: P M
authors.initials: PM
authors.lastname: Sheverdyaeva
authors.forename: P
authors.initials: P
authors.lastname: Moras
authors.forename: D
authors.initials: D
authors.lastname: Topwal
authors.forename: A
authors.initials: A
authors.lastname: Harasawa
authors.forename: K
authors.initials: K
authors.lastname: Kobayashi
authors.forename: C
authors.initials: C
authors.lastname: Carbone
authors.forename: I
authors.initials: I
authors.lastname: Matsuda