Moiré contrast in the local tunneling barrier height images of monolayer graphite on Pt(111)

Abstract

Moir\'e contrast between monolayer graphite and Pt(111) lattices is observed in local tunneling barrier height (LBH) images, where LBH's are calibrated with quasistatic $I\ensuremath{-}z$ measurements. The observed Moir\'e amplitude of 1.6 eV, much larger than the possible maximum amplitude due to the electronic interference between lattices, suggests that there exists the spatial modulation of the microscopic work function of monolayer graphite in a nanometer scale originated from the interaction between layered adsorbate and substrate.