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Giant edge state splitting at atomically precise graphene zigzag edges

Author

Listed:
  • Shiyong Wang

    (Nanotech@surfaces Laboratory, Empa, Swiss Federal Laboratories for Materials Science and Technology)

  • Leopold Talirz

    (Nanotech@surfaces Laboratory, Empa, Swiss Federal Laboratories for Materials Science and Technology)

  • Carlo A. Pignedoli

    (Nanotech@surfaces Laboratory, Empa, Swiss Federal Laboratories for Materials Science and Technology
    NCCR MARVEL, Empa, Swiss Federal Laboratories for Materials Science and Technology)

  • Xinliang Feng

    (Max Planck Institute for Polymer Research)

  • Klaus Müllen

    (Max Planck Institute for Polymer Research)

  • Roman Fasel

    (Nanotech@surfaces Laboratory, Empa, Swiss Federal Laboratories for Materials Science and Technology
    University of Bern)

  • Pascal Ruffieux

    (Nanotech@surfaces Laboratory, Empa, Swiss Federal Laboratories for Materials Science and Technology)

Abstract

Zigzag edges of graphene nanostructures host localized electronic states that are predicted to be spin-polarized. However, these edge states are highly susceptible to edge roughness and interaction with a supporting substrate, complicating the study of their intrinsic electronic and magnetic structure. Here, we focus on atomically precise graphene nanoribbons whose two short zigzag edges host exactly one localized electron each. Using the tip of a scanning tunnelling microscope, the graphene nanoribbons are transferred from the metallic growth substrate onto insulating islands of NaCl in order to decouple their electronic structure from the metal. The absence of charge transfer and hybridization with the substrate is confirmed by scanning tunnelling spectroscopy, which reveals a pair of occupied/unoccupied edge states. Their large energy splitting of 1.9 eV is in accordance with ab initio many-body perturbation theory calculations and reflects the dominant role of electron–electron interactions in these localized states.

Suggested Citation

  • Shiyong Wang & Leopold Talirz & Carlo A. Pignedoli & Xinliang Feng & Klaus Müllen & Roman Fasel & Pascal Ruffieux, 2016. "Giant edge state splitting at atomically precise graphene zigzag edges," Nature Communications, Nature, vol. 7(1), pages 1-6, September.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11507
    DOI: 10.1038/ncomms11507
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    Cited by:

    1. S. E. Ammerman & V. Jelic & Y. Wei & V. N. Breslin & M. Hassan & N. Everett & S. Lee & Q. Sun & C. A. Pignedoli & P. Ruffieux & R. Fasel & T. L. Cocker, 2021. "Lightwave-driven scanning tunnelling spectroscopy of atomically precise graphene nanoribbons," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    2. Dongfei Wang & De-Liang Bao & Qi Zheng & Chang-Tian Wang & Shiyong Wang & Peng Fan & Shantanu Mishra & Lei Tao & Yao Xiao & Li Huang & Xinliang Feng & Klaus Müllen & Yu-Yang Zhang & Roman Fasel & Pasc, 2023. "Twisted bilayer zigzag-graphene nanoribbon junctions with tunable edge states," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    3. Jens Brede & Nestor Merino-Díez & Alejandro Berdonces-Layunta & Sofía Sanz & Amelia Domínguez-Celorrio & Jorge Lobo-Checa & Manuel Vilas-Varela & Diego Peña & Thomas Frederiksen & José I. Pascual & Di, 2023. "Detecting the spin-polarization of edge states in graphene nanoribbons," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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