Linear plasmon dispersion in single-wall carbon nanotubes and the collective excitation spectrum of graphene

Autor(en)

Christian Kramberger, R Hambach, C Giorgetti, Mark Rümmeli, Martin Knupfer, J. Fink, Bernd Büchner, Lucia Reining, Erik Einarsson, Shigeo Maruyama, F Sottile, K Hannewald, V Olevano, A G Marinopoulos, Thomas Pichler

Abstrakt

We have measured a strictly linear π plasmon dispersion along the axis of individualized single-wall carbon nanotubes, which is completely different from plasmon dispersions of graphite or bundled single-wall carbon nanotubes. Comparative ab initio studies on graphene-based systems allow us to reproduce the different dispersions. This suggests that individualized nanotubes provide viable experimental access to collective electronic excitations of graphene, and it validates the use of graphene to understand electronic excitations of carbon nanotubes. In particular, the calculations reveal that local field effects cause a mixing of electronic transitions, including the “Dirac cone,” resulting in the observed linear dispersion

Organisation(en)

Elektronische Materialeigenschaften

Externe Organisation(en)

Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, Helmholtz-Zentrum Berlin für Materialien und Energie, École Polytechnique, University of Tokyo

Journal

Physical Review Letters

Band

100

Anzahl der Seiten

4

ISSN

0031-9007

DOI

https://doi.org/10.1103/PhysRevLett.100.196803

Publikationsdatum

2008

Peer-reviewed

Ja

ÖFOS 2012

1030 Physik, Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/2e5bd35f-bddb-4256-a5b3-9d1dbed78fb0