Authors

R. Rao; D. Tishler; J. Katoch;M. Ishigami

Comments

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Abbreviated Journal Title

Phys. Rev. B

Keywords

CARBON NANOTUBES; GRAPHITE; SPECTRUM; SINGLE; Physics, Condensed Matter

Abstract

We report on multiphonon Raman scattering in graphene samples. Higher-order combination modes involving three and four phonons are observed in single-layer, bilayer, and few-layer graphene samples prepared by mechanical exfoliation. The intensity of the higher-order phonon modes (relative to the G peak) is highest in single-layer graphene and decreases with increasing layers. In addition, all higher-order modes are observed to upshift in frequency almost linearly with increasing graphene layers, betraying the underlying interlayer van der Waals interactions.

Journal Title

Physical Review B

Volume

84

Issue/Number

11

Publication Date

1-1-2011

Document Type

Article

Language

English

First Page

4

WOS Identifier

WOS:000294776700002

ISSN

1098-0121

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