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Plasmon spectroscopy of the thinnest possible membrane, a single layer of carbon atoms: graphene, has been carried out in conjunction with ab initio calculations of the low loss function. We observe π and π+σ -surface plasmon modes in free-standing single sheets at 4.7 and 14.6 eV, which are substantially redshifted from their values in graphite. These modes are in very good agreement with the theoretical spectra, which find the π - and π+σ in-plane modes of graphene at 4.8 and 14.5 eV. We also find that there is little loss caused by out-of-plane modes for energies less than about 10 eV. © 2008 The American Physical Society.
Author(s): Eberlein T, Bangert U, Nair RR, Jones R, Gass M, Bleloch AL, Novoselov KS, Geim A, Briddon PR
Publication type: Article
Publication status: Published
Journal: Physical Review B
Year: 2008
Volume: 77
Issue: 23
ISSN (print): 1098-0121
ISSN (electronic): 1550-235X
Publisher: American Physical Society
URL: http://dx.doi.org/10.1103/PhysRevB.77.233406
DOI: 10.1103/PhysRevB.77.233406
Notes: Article no. 233406 4 pages
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