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

TitleLinear plasmon dispersion in single-wall carbon nanotubes and the collective excitation spectrum of graphene
Publication TypePalaiseau Article

Nanoquanta, IDRIS

Author Address

Kramberger, C (Reprint Author), IFW Dresden, Helmholtzstr 20, D-01069 Dresden, Germany. {[}Kramberger, C.; Ruemmeli, M. H.; Knupfer, M.; Fink, J.; Buechner, B.; Pichler, T.] IFW Dresden, D-01069 Dresden, Germany. {[}Hambach, R.; Giorgetti, C.; Reining, Lucia; Sottile, F.; Marinopoulos, A. G.] CEA DSM, CNRS, Ecole Polytech, Solides Irradies Lab, F-91128 Palaiseau, France. {[}Hambach, R.; Hannewald, K.] Univ Jena, IFTO, D-07743 Jena, Germany. {[}Fink, J.] BESSY, D-12481 Berlin, Germany. {[}Einarsson, E.; Maruyama, S.] Univ Tokyo, Dept Mech Engn, Bunkyo Ku, Tokyo 1138656, Japan. {[}Olevano, V.] CNRS, Inst Neel, Grenoble, France. {[}Olevano, V.] UJF, Grenoble, France. {[}Marinopoulos, A. G.] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA. {[}Pichler, T.] Univ Vienna, Inst Mat Phys, A-1090 Vienna, Austria.

Kramberger, C, Hambach, R, Giorgetti, C, Ruemmeli, MH, Knupfer, M, Fink, J, Buechner, B, Reining, L, Einarsson, E, Maruyama, S, Sottile, F, Hannewald, K, Olevano, V, Marinopoulos, A-G, Pichler, T
Year of Publication2008
JournalPhys. Rev. Lett.

We have measured a strictly linear pi 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.

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