In-plane orientation effects on the electronic structure, stability and Raman scattering of monolayer graphene on Ir(111)

Details In-plane orientation effects on the electronic structure, stability and Raman scattering of monolayer graphene on Ir(111) In-plane orientation effects on the electronic structure, stability and Raman scattering of monolayer graphene on Ir(111)

2010-12-13

arxiv.org/abs/1012.2826v1

Physics

Condensed Matter

Materials Science

Manuscript plus 7 figures

Scientific paper

We employ angle-resolved photoemission spectroscopy (ARPES) to investigate the electronic structures of two rotational variants of epitaxial, single-layer graphene on Ir(111). As grown, the more-abundant R0 variant is nearly charge-neutral, with strong hybridization between graphene and Ir bands near the Fermi level. The graphene Fermi surface and its replicas exactly coincide with Van Hove singularities in the Ir Fermi surface. Sublattice symmetry breaking introduces a small gap-inducing potential at the Dirac crossing, which is revealed by n-doping the graphene using K atoms. The energy gaps between main and replica bands (originating from the moir\'e interference pattern between graphene and Ir lattices) is shown to be non-uniform along the mini- zone boundary due to hybridization with Ir bands. An electronically mediated interaction is proposed to account for the stability of the R0 variant. The variant rotated 30{\deg} in-plane, R30, is p-doped as grown and K doping reveals no band gap at the Dirac crossing. No replica bands are found in ARPES measurements. Raman spectra from the R30 variant exhibit the characteristic phonon modes of graphene, while R0 spectra are featureless. These results show that the film/substrate interaction changes from chemisorption (R0) to physisorption (R30) with in-plane orientation. Finally, graphene-covered Ir has a work function lower than the clean substrate but higher than graphite.

Affiliated with

Also associated with

No associations

Rating

In-plane orientation effects on the electronic structure, stability and Raman scattering of monolayer graphene on Ir(111) does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with In-plane orientation effects on the electronic structure, stability and Raman scattering of monolayer graphene on Ir(111), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and In-plane orientation effects on the electronic structure, stability and Raman scattering of monolayer graphene on Ir(111) will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-27840