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Exciton-dominated optical response of ultra-narrow graphene nanoribbons

Author

Listed:
  • Richard Denk

    (Institute of Experimental Physics, Johannes Kepler University)

  • Michael Hohage

    (Institute of Experimental Physics, Johannes Kepler University)

  • Peter Zeppenfeld

    (Institute of Experimental Physics, Johannes Kepler University)

  • Jinming Cai

    (Empa, Swiss Federal Laboratories for Materials Science and Technology)

  • Carlo A. Pignedoli

    (Empa, Swiss Federal Laboratories for Materials Science and Technology)

  • Hajo Söde

    (Empa, Swiss Federal Laboratories for Materials Science and Technology)

  • Roman Fasel

    (Empa, Swiss Federal Laboratories for Materials Science and Technology
    University of Bern)

  • Xinliang Feng

    (Max Planck Institute for Polymer Research)

  • Klaus Müllen

    (Max Planck Institute for Polymer Research)

  • Shudong Wang

    (CNR-Nanoscience Institute, S3 Center)

  • Deborah Prezzi

    (CNR-Nanoscience Institute, S3 Center)

  • Andrea Ferretti

    (CNR-Nanoscience Institute, S3 Center)

  • Alice Ruini

    (CNR-Nanoscience Institute, S3 Center
    Mathematics, and Informatics, University of Modena and Reggio Emilia)

  • Elisa Molinari

    (CNR-Nanoscience Institute, S3 Center
    Mathematics, and Informatics, University of Modena and Reggio Emilia)

  • Pascal Ruffieux

    (Empa, Swiss Federal Laboratories for Materials Science and Technology)

Abstract

Narrow graphene nanoribbons exhibit substantial electronic bandgaps and optical properties fundamentally different from those of graphene. Unlike graphene—which shows a wavelength-independent absorbance for visible light—the electronic bandgap, and therefore the optical response, of graphene nanoribbons changes with ribbon width. Here we report on the optical properties of armchair graphene nanoribbons of width N=7 grown on metal surfaces. Reflectance difference spectroscopy in combination with ab initio calculations show that ultranarrow graphene nanoribbons have fully anisotropic optical properties dominated by excitonic effects that sensitively depend on the exact atomic structure. For N=7 armchair graphene nanoribbons, the optical response is dominated by absorption features at 2.1, 2.3 and 4.2 eV, in excellent agreement with ab initio calculations, which also reveal an absorbance of more than twice the one of graphene for linearly polarized light in the visible range of wavelengths.

Suggested Citation

  • Richard Denk & Michael Hohage & Peter Zeppenfeld & Jinming Cai & Carlo A. Pignedoli & Hajo Söde & Roman Fasel & Xinliang Feng & Klaus Müllen & Shudong Wang & Deborah Prezzi & Andrea Ferretti & Alice R, 2014. "Exciton-dominated optical response of ultra-narrow graphene nanoribbons," Nature Communications, Nature, vol. 5(1), pages 1-7, September.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5253
    DOI: 10.1038/ncomms5253
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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.

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