Fingerprints of Dirac points in first-principles scanning tunneling spectra of graphene on a metal substrate

Abstract

Graphene physisorbed on a metal has its characteristic Dirac cones preserved in the band-structure, but the Fermi level of the system is shifted due to the interaction with the substrate. Based on density functional calculations with van der Waals corrections, we present a method to determine the position of the Dirac point with respect to the Fermi level from the measured scanning tunneling spectra (STS). It has been demonstrated that the dips in both simulated local density of states and in the observed dI/dV profiles are indeed the fingerprints of the Dirac points. The type and the level of doping can be then inferred directly from the STS data without any additional experimental technique. Test calculations of graphene on a Cu(111) substrate have shown that the predicted position of the Dirac point is in close proximity to the experimental value reported in the recent studies. Moreover, simulations for graphene on a Pt(111) surface allow us to explain the apparent contradictions in the state-of-the-art experimental works.

References in corpus (10)

• Electric Field Effect in Atomically Thin Carbon Films
• The electronic properties of graphene
• Doping graphene with metal contacts
• Graphene field-effect-transistors with high on/off current ratio and large transport band gap at room temperature
• Periodically rippled graphene: growth and spatially resolved electronic structure
• Two Dimensional Ir-Cluster Lattices on Moiré of Graphene with Ir(111)
• Giant Phonon-induced Conductance in Scanning Tunneling Spectroscopy of Gate-tunable Graphene
• Point defects on graphene on metals
• Synthesis of Graphene on Gold
• Doping of graphene by a Au(111) substrate: Calculation strategy within the local density approximation and a semiempirical van der Waals approach

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• Domains of doping in graphene on polycrystalline gold: first-principles and scanning tunneling spectroscopy studies
• Spin-orbit proximity effect in graphene on metallic substrates: decoration vs intercalation with metal adatoms
• Complex spin texture of Dirac cones induced via spin-orbit proximity effect in graphene on metals
• Energy-resolved tip-orbital fingerprint in scanning tunneling spectroscopy based on the revised Chen's derivative rule