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Título

Spin-resolved two-photon photoemission study of the surface resonance state on Co/Cu (001)

AutorAndreyev, O.; Koroteev, Yuri M.; Sánchez Albaneda, M.; Cinchetti, Mirko; Bihlmayer, Gustav; Chulkov, Eugene V. CSIC ORCID; Lange, J.; Steeb, F.; Bauer, M.; Echenique, Pedro M. CSIC ORCID; Blügel, S.; Aeschlimann, M.
Fecha de publicación2006
EditorAmerican Physical Society
CitaciónPhysical Review B 74(19): 195416 (2006)
ResumenBulk and surface states of a clean and Cs-doped surface of a Co film grown on Cu(001) have been studied by spin-resolved photoemission (SR-PE) and compared with band structure calculation results. One-photon (1PPE) and two-photon (2PPE) photoemission spectra from clean Co films are found to be dominated by a peak located at a binding energy of about 0.4eV with respect to EF, which is assigned to the spin up 3d bulk state. Slight Cs-doping of a Co(001) surface shifts an image potential state in resonance with the sp-states of the conduction band. SR-2PPE study of the optically-induced electron population in such an image resonance reveals a strong dependence on the set polarization of the laser light. We are able to directly detect the spin polarization of electrons photoemitted from the image resonance state, which can be varied from highly-polarized (about bulk values) to almost unpolarized when tuning light polarization of the pump laser pulse from s to p.
Versión del editorhttps://doi.org/10.1103/PhysRevB.74.195416
URIhttp://hdl.handle.net/10261/226016
DOI10.1103/PhysRevB.74.195416
ISSN2469-9950
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