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

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

Publications: Contribution to journalArticlePeer Reviewed

Abstract

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
Original languageEnglish
Article number196803
Number of pages4
JournalPhysical Review Letters
Volume100
DOIs
Publication statusPublished - 2008

Austrian Fields of Science 2012

  • 1030 Physics, Astronomy

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