Comparison of electronic structure and template function of single-layer graphene and a hexagonal boron nitride nanomesh on Ru(0001)

The structure of a single-layer graphene on Ru(0001) is compared with that of a single-layer hexagonal boron nitride nanomesh on Ru(0001). Both are corrugated sp(2) hybridized networks and display a pi band gap at the (K) over bar point of their 1 x 1 Brillouin zone. In contrast to h-BN/Ru(0001), g/Ru(0001) has a distinct Fermi surface. Together with the band structure measurements this indicates that 0.1e per 1 x 1 unit cell are transferred from the Ru substrate to the graphene. Photoemission from adsorbed xenon on g/Ru(0001) identifies two Xe 5p(1/2) lines, separated by 240 meV, which reveals a corrugated electrostatic potential energy surface like on h-BN/Rh(111). These two Xe species are related to the topography of the template and have different desorption energies.