Abstract
The local density of states of the Au(111) surface state on flat planes, monatomic steps, narrow terraces, and in monatomic pits were measured with a scanning tunneling microscope. The experiments were performed on a single-crystal Au(111) sample in ultrahigh vacuum. We measure a decrease in the surface-state intensity by a factor of 2–10 on monatomic steps. The surface-state local density of states for narrow terraces has been found to be relatively unchanged from the value on flat (111) planes. Preliminary results for monatomic-deep sputter pits with diameters of order 25 Å show surface-state density of states peak shifts on the order of +100 meV with respect to the value on flat (111) planes. Our results are consistent with the treatment of steps as a region of weakly repulsive potential with respect to the two-dimensional nearly free-electron-like surface state. A model of surface-state tunneling incorporating this result has been developed and produces reasonable quantitative agreement with the data.
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