Superlattice-induced minigaps in graphene band structure due to underlying one-dimensional nanostructuration

We have studied the influence of one-dimensional periodic nanostructured substrates on graphene band structure. One-monolayer-thick graphene is extremely sensitive to periodic terrace arrays, as demonstrated on two different nanostructured substrates, namely Ir(332) and multivicinal curved Pt(111)....

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Bibliographic Details
Published in:Physical review. B 2018-05, Vol.97 (19), Article 195410
Main Authors: Celis, A., Nair, M. N., Sicot, M., Nicolas, F., Kubsky, S., Malterre, D., Taleb-Ibrahimi, A., Tejeda, A.
Format: Article
Language:English
Subjects:
Band structure
Band structure of solids
Condensed Matter
Graphene
Materials Science
Nanostructure
Order parameters
Periodic variations
Photoelectric emission
Physics
Potential barriers
Substrates
Superlattices
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Summary:We have studied the influence of one-dimensional periodic nanostructured substrates on graphene band structure. One-monolayer-thick graphene is extremely sensitive to periodic terrace arrays, as demonstrated on two different nanostructured substrates, namely Ir(332) and multivicinal curved Pt(111). Photoemission shows the presence of minigaps related to the spatial periodicity. The potential barrier strength of the one-dimensional periodic nanostructuration can be tailored with the step-edge type and the nature of the substrate. The minigap opening further demonstrates the presence of backward scattered electronic waves on the surface and the absence of Klein tunneling on the substrate, probably due to the fast variation of the potential, of a spatial extent of the order of the lattice parameter of graphene.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.97.195410