Influence of the herringbone reconstruction on the surface electronic structure of Au(111)

We present angular-resolved photoemission investigations of the Shockley-type surface state on the reconstructed (111) surface of gold. The so-called herringbone reconstruction, with three different (22xroot3)domain orientations, forms a super-lattice that has a clearly observable influence on the surface electronic structure. In the L gap of the projected bulk states, there appears a non-uniform photoemission intensity distribution due to the back-folding of the Shockley state at the Bragg planes of the reduced surface Brillouin zone. Furthermore, there is a clear indication of the existence of surface-state band gaps in the electronic density of states of the Shockley state.