Figure 2: Geometrical structure and hybridization of the Au monolayer under graphene.
From: Giant Rashba splitting in graphene due to hybridization with gold
(a) STM and (b) LEED for 1.1 monolayer (ML) of gold under the graphene layer with a 9 × 9 moiré-type superstructure. A scale bar at the panel a corresponds to 400 Å. (c) Angle-resolved photoemission (first derivative of the intensity over energy). Hybridization between π state of graphene and 5d states of Au is emphasized by the dashed red lines. Orange arrows show π-band replicas shifted to the larger and smaller k|| values because of the 9 × 9 superstructure. White dashed lines denote the k|| values for which the spin-resolved spectra displayed in d were measured (hν=62 eV). (d) Spin-resolved measurements in the region of hybridization between the graphene and gold bands. It is seen that the spin–split π states develop directly out of a large spin–orbit splitting of Au 5d states. Blue and red triangles denote spectra for opposite spin. Blue and red dashed lines emphasize dispersion of bands. Yellow-shaded area shows the region of Au 5d states.
