@article{318,
  keywords = {paper},
  author = {C. Kramberger and R. Hambach and Christine Giorgetti and M. Ruemmeli and M. Knupfer and J. Fink and B. Buechner and Lucia Reining and E. Einarsson and S. Maruyama and Francesco Sottile and K. Hannewald and Olevano V and A-G Marinopoulos and T. Pichler},
  title = {Linear plasmon dispersion in single-wall carbon nanotubes and the collective excitation spectrum of graphene},
  abstract = {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.},
  year = {2008},
  journal = {Phys. Rev. Lett.},
  volume = {100},
  number = {19},
  publisher = {AMER PHYSICAL SOC},
  address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA},
  url = {http://dx.doi.org/10.1103/PhysRevLett.100.196803},
  doi = {10.1103/PhysRevLett.100.196803},
}