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Article Dans Une Revue Journal of Electron Spectroscopy and Related Phenomena Année : 2012

Experimental correlation between photoemission matrix elements and LEED intensities in superperiodic structures

Waked Srour
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  • PersonId : 776849
  • IdRef : 172270545
Antonio Tejeda
Alessandro Nicolaou
  • Fonction : Auteur
  • PersonId : 991846
Patrick Le Fèvre
François Bertran
Amina Taleb-Ibrahimi
Daniel Malterre

Résumé

A direct comparison between photoemission measurements and band structure calculations is sometimes tricky. Matrix element effects may affect considerably the spectral weight of the electronic states and prevent the expected translational symmetry of the band structure from being observed. We show how matrix element effects can be qualitatively described to a certain extent by making an analogy between photoemission and low energy electron diffraction. We have tested this approach in two superperiodic systems. We have first explained the intensity distribution in different Brillouin zones of a surface state in Si(1 1 1)-(7 × 7), where the surface state spectral intensity does not exhibit the (7 × 7) symmetry. We have also compared the LEED intensity of superperiodic LEED spots with the energy dependence of bulk bands on a facetted Si surface as measured by photoemission.

Dates et versions

hal-04223012 , version 1 (29-09-2023)

Identifiants

Citer

Waked Srour, Antonio Tejeda, Alessandro Nicolaou, Patrick Le Fèvre, François Bertran, et al.. Experimental correlation between photoemission matrix elements and LEED intensities in superperiodic structures. Journal of Electron Spectroscopy and Related Phenomena, 2012, 185 (11), pp.441-447. ⟨10.1016/j.elspec.2012.08.005⟩. ⟨hal-04223012⟩
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