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Title: Orbital dependent Rashba splitting and electron-phonon coupling of 2D Bi phase on Cu(100) surface

A monolayer of bismuth deposited on the Cu(100) surface forms a highly ordered c(2×2) reconstructed phase. The low energy single particle excitations of the c(2×2) Bi/Cu(100) present Bi-induced states with a parabolic dispersion in the energy region close to the Fermi level, as observed by angle-resolved photoemission spectroscopy. The electronic state dispersion, the charge density localization, and the spin-orbit coupling have been investigated combining photoemission spectroscopy and density functional theory, unraveling a two-dimensional Bi phase with charge density well localized at the interface. The Bi-induced states present a Rashba splitting, when the charge density is strongly localized in the Bi plane. Furthermore, the temperature dependence of the spectral density close to the Fermi level has been evaluated. Dispersive electronic states offer a large number of decay channels for transitions coupled to phonons and the strength of the electron-phonon coupling for the Bi/Cu(100) system is shown to be stronger than for Bi surfaces and to depend on the electronic state symmetry and localization.
Authors:
; ;  [1] ; ; ;  [2] ;  [3]
  1. Dipartimento di Fisica, Università di Roma “La Sapienza,” Piazzale A. Moro 5, I-00185 Roma (Italy)
  2. Synchrotron SOLEIL, Saint-Aubin-BP 48, F-91192 Gif sur Yvette (France)
  3. Center for Life Nano Science - Sapienza, Istituto Italiano di Tecnologia and European Theoretical Spectroscopy Facility (ETSF), Viale Regina Elena 291, I-00161, Roma (Italy)
Publication Date:
OSTI Identifier:
22251487
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 139; Journal Issue: 18; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; BISMUTH; CHARGE DENSITY; DENSITY FUNCTIONAL METHOD; DEPOSITS; DISPERSIONS; ELECTRON-PHONON COUPLING; EXCITATION; FERMI LEVEL; INTERFACES; L-S COUPLING; PHOTOEMISSION; SPECTRAL DENSITY; SPECTROSCOPY; SURFACES; TEMPERATURE DEPENDENCE