Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 6: Electronic structure I
O 6.5: Vortrag
Montag, 23. März 2009, 12:15–12:30, SCH A216
The influence of reconstruction on the surface state of Au(110) — •Andreas Nuber1, Mitsuharu Higashiguchi2, Frank Forster1, Peter Blaha3, Kenya Shimada4, and Friedrich Reinert1,5 — 1Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany — 2Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan — 3Institute of Materials Chemistry, Vienna University of Technology, Getreidemarkt 9/165, A-1060 Vienna, Austria — 4Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan — 5Forschungszentrum Karlsruhe, Gemeinschaftslabor für Nanoanalytik, D-76021 Karlsruhe, Germany
We present high-resolution angle-resolved photoelectron spectroscopy on Au(110). The unreconstructed surface shows a Shockley-type surface state at E0=590 meV whereas on the (2×1) missing-row reconstructed surface no such surface state below EF can be detected [1]. We performed relativistic LDA calculations which agree well with our experimental data. Adsorption of 1 ML Ag on the (2×1) reconstructed surface results in a destruction to a (1×1) surface structure and a Shockley state appears at E0=475 meV. Shifting down the surface state from just above to below EF by Na adsorption allowed to extrapolate a binding energy on the reconstructed surface of E0=−120 meV above the Fermi level.
[1] A. Nuber et al. Phys. Rev B 78, 195412 (2008).