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Etude des propriétés électroniques et structurales des films ultra minces d'Ag sur Cu(111)

Abstract : In this thesis, Epitaxial Ag ultra thin films grown on Cu(111) have been studied by Scanning Tunnelling Microscopy (STM) and Angle-Resolved Photoemission Spectroscopy (ARPES). In the submonolayer range, two dispersive bands are observed, arising from Shockley like surface state confined in Ag islands and in the Cu terraces. A thickness dependence of the surface state energy is evidenced. Moreover, the two well-known atomic reconstructions (moiré and triangular superstructures which depend on the preparation temperature) lead to different surface state energies. Photoemission spectra also reflect the transition from metastable moiré structure into the triangular one. Especially, a transient state has been evidenced both from STM and ARPES data. These results clearly demonstrate the strong sensitivity of the surface-state energy to the in-plane atomic structure.
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http://docnum.univ-lorraine.fr/prive/SCD_T_2003_0112_BENDOUNAN.pdf
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Submitted on : Thursday, March 29, 2018 - 10:45:31 AM
Last modification on : Thursday, November 12, 2020 - 3:42:03 PM

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Azzedine Bendounan. Etude des propriétés électroniques et structurales des films ultra minces d'Ag sur Cu(111). Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2003. Français. ⟨NNT : 2003NAN10112⟩. ⟨tel-01746823⟩

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