Abstract
In this work, we have investigated the spectral function of graphene on a monolayer of intercalated gold on Ru(0001) using angle-resolved photoemission spectroscopy (ARPES). The intercalation leads to a decoupling of the graphene film, as documented by emergence of the characteristic linear π-bands near the Fermi level. However, a band gap at the band crossing is observed. We relate this gap opening to the broken symmetry of the two carbon sublattices, induced by the special lattice mismatch of the graphene and the intercalated gold monolayer.
Highlights
Since its first preparation by exfoliation[1, 2], graphene has become one of the most discussed topics in materials science
We have investigated the spectral function of graphene on a monolayer of intercalated gold on Ru(0001) using angle-resolved photoemission spectroscopy (ARPES)
The spectral function of the buffer layer is characterized by the absence of well-ordered structure of the graphene π-bands in the vicinity of the Fermi level, in agreement with a previous study[30] that shows that the Dirac energy ED in the buffer layer on Ru is shifted by 2.6 eV to higher binding energies compared to those for pure graphite
Summary
Since its first preparation by exfoliation[1, 2], graphene has become one of the most discussed topics in materials science. We show in a single system–graphene grown on the Ru(0001) surface–that the behavior of the graphene bands near ED can be selected between these extremes, from exhibiting the specific many body kinks to a situation where a gap appears, controlling the structure of the graphene-Ru interface.
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