title: Excitonic fano resonance in free-standing graphene.
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.
authors.affiliation: Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.
authors.forename: Dong-Hun
authors.initials: DH
authors.lastname: Chae
authors.forename: Tobias
authors.initials: T
authors.lastname: Utikal
authors.forename: Siegfried
authors.initials: S
authors.lastname: Weisenburger
authors.forename: Harald
authors.initials: H
authors.lastname: Giessen
authors.forename: Klaus V
authors.initials: KV
authors.lastname: Klitzing
authors.forename: Markus
authors.initials: M
authors.lastname: Lippitz
authors.forename: Jurgen
authors.initials: J
authors.lastname: Smet