Mini-Dirac cones in the band structure of a copper intercalated epitaxial graphene superlattice

Forti, S. (author): Max Planck Institute for Solid State Research,Italian Institute of Technology

Zakharov, A. A. (author): Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory

(creator_code:org_t)

Related links:: http://dx.doi.org/10...; show more...; https://lup.lub.lu.s...; https://doi.org/10.1...; show less...

Abstract Subject headings

The electronic band structure of an epitaxial graphene superlattice, generated by intercalating a monolayer of Cu atoms, is directly imaged by angle-resolved photoelectron spectroscopy. The 3.2 nm lateral period of the superlattice is induced by a varying registry between the graphene honeycomb and the Cu atoms as imposed by the heteroepitaxial interface Cu/SiC. The carbon atoms experience a lateral potential across the supercell of an estimated value of about 65 meV. The potential leads to strong energy renormalization in the band structure of the graphene layer and the emergence of mini-Dirac cones. The mini-cones' band velocity is reduced to about half of graphene's Fermi velocity. Notably, the ordering of the interfacial Cu atoms can be reversibly blocked by mild annealing. The superlattice indeed disappears at∼220 °C.

By the author/editor: Forti, S.; Stöhr, A.; Zakharov, A. A.; Coletti, C.; Emtsev, K. V.; Starke, U.

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Other Physics To ...

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