The graphene phonon dispersion with C¹² and C¹³ isotopes

DOIResolve DOI: http://doi.org/10.1063/1.4848322
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TypeArticle
Proceedings titleAIP Conference Proceedings
ConferenceThe Physics of Semiconductors : Proceedings of the 31st International Conference on the Physics of Semiconductors (ICPS) 2012, July 29th-August 3rd, 2012, Zurich, Switzerland
Volume1566
Issue1
Pages135136
AbstractUsing very uniform large scale chemical vapor deposition grown graphene transferred onto silicon, we were able to identify 15 distinct Raman lines associated with graphene monolayers. This was possible thanks to a combination of different carbon isotopes and different Raman laser energies and extensive averaging without increasing the laser power. This allowed us to obtain a detailed experimental phonon dispersion relation for many points in the Brillouin zone. We further identified a D+D' peak corresponding to a double phonon process involving both an inter- and intra-valley phonon. In order to both eliminate substrate effects and to probe large areas, we undertook to study Raman scattering for large scale chemical vapor deposition (CVD) grown graphene using two different isotopes (C12 and C13) so that we can effectively exclude and subtract the substrate contributions, since a heavier mass downshifts only the vibrational properties, while keeping all other properties the same.
Publication date
PublisherAIP
LanguageEnglish
AffiliationSecurity and Disruptive Technologies; National Research Council Canada
Peer reviewedYes
NPARC number23001793
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Record identifierec8afa05-5892-42fa-b2c4-0d41967616a6
Record created2017-04-07
Record modified2017-04-07
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