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Journal Article

Excitonic Fano Resonance in Free-Standing Graphene

MPS-Authors
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Chae,  D. H.
Research Group Solid State Nanophysics (Jurgen H. Smet), Max Planck Institute for Solid State Research, Max Planck Society;
Abteilung v. Klitzing, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

/persons/resource/persons280604

Utikal,  T.
Former Research Groups, Max Planck Institute for Solid State Research, Max Planck Society;

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Giessen,  H.
Former Research Groups, Max Planck Institute for Solid State Research, Max Planck Society;

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von Klitzing,  K.
Abteilung v. Klitzing, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

Lippitz,  M.
Max Planck Society;

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Smet,  J.
Abteilung v. Klitzing, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Research Group Solid State Nanophysics (Jurgen H. Smet), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Chae, D. H., Utikal, T., Weisenburger, S., Giessen, H., von Klitzing, K., Lippitz, M., et al. (2011). Excitonic Fano Resonance in Free-Standing Graphene. Nano Letters, 11(3), 1379-1382.


Cite as: https://hdl.handle.net/21.11116/0000-000E-C01D-9
Abstract
We investigate the role of electron-hole correlations in the absorption of free-standing monolayer and bilayer graphene using optical transmission spectroscopy from 1.5 to 5.5 eV. Line shape analysis demonstrates that the ultraviolet region is dominated by an asymmetric Fano resonance. We attribute this to an excitonic resonance that forms near the van Hove singularity at the saddle point of the band structure and couples to the Dirac continuum. The Fano model quantitatively describes the experimental data all the way down to the infrared. In contrast, the common noninteracting particle picture cannot describe our data. These results suggest a profound connection between the absorption properties and the topology of the graphene band structure.