Effect of moiré superlattice reconstruction in the electronic excitation spectrum of graphene-metal heterostructures
arXiv:1604.02905 · doi:10.1088/2053-1583/aa53ba
Abstract
We have studied the electronic excitation spectrum in periodically rippled graphene on Ru(0001) and flat, commensurate graphene on Ni(111) by means of high-resolution electron energy loss spectroscopy and a combination of density functional theory and tight-binding approaches. We show that the periodic moiré superlattice originated by the lattice mismatch in graphene/Ru(0001) induces the emergence of an extra mode, which is not present in graphene/Ni(111). Contrary to the ordinary intra-band plasmon of doped graphene, the extra mode is robust in charge-neutral graphene/metal contacts, having its origin in electron-hole inter-band transitions between van Hove singularities that emerge in the reconstructed band structure, due to the moiré pattern superlattice.
Supplemental materials available at http://www.theorphys.science.ru.nl/people/yuan/
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