Electronic structure of reconstructed Au(100): Two-dimensional and one-dimensional surface states

Abstract

The clean surface of Au(100) presents a complex reconstruction characterized by a hexagonal topmost layer. We report an angle-resolved photoemission study of the electronic structure of this surface, including an analysis of the Fermi surface, combined with structural information from low-energy electron diffraction and scanning tunneling microscopy. In the complex Fermi surface map found, we identify different contributions from the bulk bands, from interface states located below the hexagonal topmost layer, and from the hexagonal topmost layer itself. The electronic states related to this layer exhibit quasi-one-dimensional character, in agreement with the chain aspect of the reconstructed layer, as demonstrated by their dispersion, periodicity, and reciprocal space location.

Soft nanohand grabs a growing nanoparticle

“…its unrelaxed bulk-like dimensions (when wrapped with dendrons, it re-expands to about 1.43 nm, a 3% contraction from the unrelaxed value 1.47 nm). Such values are consistent with experimentally known contractions of 4 to 5% in Au(111) and Au(100) surfaces and Au NPs, 37,39 as well as the well-known re-expansion due to binding to atoms and molecules added to the surface (adsorbates). 41 We found that the three anchors point away from the Au NP, toward the bottom in Fig.…”

“…This is equivalent to Au crystal surfaces in vacuum being ''reconstructed'', i.e. their structure deviates strongly from the bulk Au crystal structure in their outer atomic layer [37][38][39] ). In addition, the exact number of Au atoms in the NPs is not known.…”

Au(100) as a Template for Pentacene Monolayer

“…In contrast to Au(100), the adsorption of 1 ML of PEN or α-6T on Au(111) does not affect the herringbone reconstruction [ 29 , 36 ]. That indicates the influence of surface reconstruction, which is linked with surface electron states [ 37 , 38 ], on the molecule–Au interactions. Our results reveal that the arrangement of PEN on the unreconstructed Au(100) areas corresponds with that occurring in the surrounding domains laying on the hex stripes.…”

Nonlinear optical response of a gold surface in the visible range: A study by two-color sum-frequency generation spectroscopy. III. Simulations of the experimental SFG intensities

“…31,43 On Au(100), a state, probably related to d-bands, 44 is described atM point at 1.6 eV below E F 45 on both normal and reconstructed surfaces, but no arrival state has been described for a surface transition. On the contrary, a Shockley state is located around 0.2 eV below the Fermi level on the reconstructed surfaces atX point, 46 while an empty state has been calculated around 2 eV above E F . 40 This leads to a surface transition with energies around 2.6 eV in electroreflectance spectroscopy 30 for the uncharged surface.…”