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Excitonic Fano Resonance in Free-Standing Graphene

Title data

Chae, Dong-Hun ; Utikal, Tobias ; Weisenburger, Siegfried ; Giessen, Harald ; von Klitzing, Klaus ; Lippitz, Markus ; Smet, Jurgen:
Excitonic Fano Resonance in Free-Standing Graphene.
In: Nano Letters. Vol. 11 (March 2011) Issue 3 . - pp. 1379-1382.
ISSN 1530-6992
DOI: https://doi.org/10.1021/nl200040q

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik III - Nanooptik
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik III - Nanooptik > Lehrstuhl Experimentalphysik III - Nanooptik - Univ.-Prof. Dr. Markus Lippitz
Result of work at the UBT: No
DDC Subjects: 500 Science
500 Science > 500 Natural sciences
500 Science > 530 Physics
Date Deposited: 16 Dec 2015 10:04
Last Modified: 16 Dec 2015 10:04
URI: https://eref.uni-bayreuth.de/id/eprint/28960