Layer‐by‐Layer Decoupling of Twisted Graphene Sheets Epitaxially Grown on a Metal Substrate

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2018
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Voloshina, Elena
Herbig, Charlotte
Knispel, Timo
Tries, Alexander
Kröger, Jörg
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The electronic properties of graphene can be efficiently altered upon interaction with the underlying substrate resulting in a dramatic change of charge carrier behavior. Here, the evolution of the local electronic properties of epitaxial graphene on a metal upon the controlled formation of multilayers, which are produced by intercalation of atomic carbon in graphene/Ir(111), is investigated. Using scanning tunneling microscopy and Landau‐level spectroscopy, it is shown that for a monolayer and bilayers with small‐angle rotations, Landau levels are fully suppressed, indicating that the metal–graphene interaction is largely confined to the first graphene layer. Bilayers with large twist angles as well as twisted trilayers demonstrate a sequence of pronounced Landau levels characteristic for a free‐standing graphene monolayer pointing toward an effective decoupling of the top layer from the metal substrate. These findings give evidence for the controlled preparation of epitaxial graphene multilayers with a different degree of decoupling, which represent an ideal platform for future electronic and spintronic applications.

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ISO 690SIMON, Sabina, Elena VOLOSHINA, Julia TESCH, Felix FÖRSCHNER, Vivien Anna-Lena ENENKEL, Charlotte HERBIG, Timo KNISPEL, Alexander TRIES, Jörg KRÖGER, Yuriy S. DEDKOV, Mikhail FONIN, 2018. Layer‐by‐Layer Decoupling of Twisted Graphene Sheets Epitaxially Grown on a Metal Substrate. In: Small. 2018, 14(13), 1703701. ISSN 1613-6810. eISSN 1613-6829. Available under: doi: 10.1002/smll.201703701
BibTex
@article{Simon2018-03Layer-42474,
  year={2018},
  doi={10.1002/smll.201703701},
  title={Layer‐by‐Layer Decoupling of Twisted Graphene Sheets Epitaxially Grown on a Metal Substrate},
  number={13},
  volume={14},
  issn={1613-6810},
  journal={Small},
  author={Simon, Sabina and Voloshina, Elena and Tesch, Julia and Förschner, Felix and Enenkel, Vivien Anna-Lena and Herbig, Charlotte and Knispel, Timo and Tries, Alexander and Kröger, Jörg and Dedkov, Yuriy S. and Fonin, Mikhail},
  note={Article Number: 1703701}
}
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