The Cu(111) Shockley surface state has been widely measured by photoemission spectroscopy as a prototypical spectroscopy experiment to show parabolic dispersion and energy resolution. Intensity asymmetries have been observed but never interpreted for lack of systematic evidence and theoretical background. Here we report an extended study of the angle-resolved photoemission intensity of the Cu(111) Shockley surface state as measured in different experimental geometries, variable synchrotron light polarization, and at different photon energies in the 18-70 eV range. Strong asymmetries appear with respect to the Γ point. We provide an interpretation of the observed intensity asymmetry based on the symmetry of the face-centered-cubic lattice and by means of density-functional theory calculations: we conclude that the origin of the asymmetry is connected with the contribution of the p -to- d photoemission channel to the total photoemission intensity, opening an unexpected view on final-state matrix element effects.

Understanding intensities of angle-resolved photoemission with circularly polarized radiation from a Cu(111) surface state / M. Mulazzi, G. Rossi, J. Braun, J. Minár, H. Ebert, G. Panaccione, I. Vobornik, J. Fujii. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 79:16(2009), pp. 165421.1-165421.8.

Understanding intensities of angle-resolved photoemission with circularly polarized radiation from a Cu(111) surface state

G. Rossi
Secondo
;
2009

Abstract

The Cu(111) Shockley surface state has been widely measured by photoemission spectroscopy as a prototypical spectroscopy experiment to show parabolic dispersion and energy resolution. Intensity asymmetries have been observed but never interpreted for lack of systematic evidence and theoretical background. Here we report an extended study of the angle-resolved photoemission intensity of the Cu(111) Shockley surface state as measured in different experimental geometries, variable synchrotron light polarization, and at different photon energies in the 18-70 eV range. Strong asymmetries appear with respect to the Γ point. We provide an interpretation of the observed intensity asymmetry based on the symmetry of the face-centered-cubic lattice and by means of density-functional theory calculations: we conclude that the origin of the asymmetry is connected with the contribution of the p -to- d photoemission channel to the total photoemission intensity, opening an unexpected view on final-state matrix element effects.
copper; density functional theory; photoelectron spectra; spectral line intensity; surface states
Settore FIS/03 - Fisica della Materia
2009
Article (author)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/555170
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