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STEM plasmon spectroscopy of free standing graphene

Lookup NU author(s): Professor Patrick Briddon

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Abstract

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 pi- and pi+ sigma-surface plasmon modes in free-standing single sheets at 4.7 eV and 14.8 eV which are substantially red-shifted from their values in graphite. These modes are in very good agreement with the theoretical spectra which find the pi- and pi + pi in-plane modes of graphene at 4.5 eV 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. (C) 2008 WILEY-NCH Verlag GmbH & Co. KGaA, Weinheim.

Publication metadata

Author(s): Bangert U, Eberlein T, Nair RR, Jones R, Gass M, Bleloch AL, Novoselov KS, Geim A, Briddon PR

Publication type: Article

Publication status: Published

Journal: Physica Status Solidi. A: Applications and Materials Science

Year: 2008

Volume: 205

Issue: 9

Pages: 2265-2269

ISSN (print): 1862-6300

ISSN (electronic): 1862-6319

Publisher: Wiley - V C H Verlag GmbH & Co. KGaA

URL: http://dx.doi.org/10.1002/pssa.200879707

DOI: 10.1002/pssa.200879707

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