Influence of reconstruction on the surface state of Au(110)

Abstract

We present high-resolution angle-resolved photoelectron spectroscopy on Au(110). The unreconstructed surface shows a Shockley-type surface state at ${E}_{0}=590\text{ }\text{meV}$ whereas on the $(2\ifmmode\times\else\texttimes\fi{}1)$ missing-row reconstructed surface no such surface state below ${E}_{F}$ can be detected. We performed relativistic local-density approximation calculations which agree well with our experimental data. Adsorption of 1 monolayer Ag on the $(2\ifmmode\times\else\texttimes\fi{}1)$ reconstructed surface results in a destruction to a $(1\ifmmode\times\else\texttimes\fi{}1)$ surface structure and a Shockley state appears at ${E}_{0}=475\text{ }\text{meV}$. Shifting down the surface state from just above to below ${E}_{F}$ by Na adsorption allowed to extrapolate a binding energy on the reconstructed surface of ${E}_{0}=\ensuremath{-}120\text{ }\text{meV}$ above the Fermi level.