The interfacial charge transfer between mechanically exfoliated few-layer graphene and Cr
2 O 3 (0001) surfaces has been investigated. Electrostatic force microscopy and Kelvin
probe force microscopy studies point to hole doping of few-layer graphene, with up to a 150
meV shift in the Fermi level, an aspect that is confirmed by Raman spectroscopy. Density
functional theory calculations furthermore confirm the p-type nature of the graphene/chromia
interface and suggest that the chromia is able to induce a significant carrier spin polarization …