https://doi.org/10.1140/epjst/e2007-00236-2
Optical phonons of graphene and nanotubes
1
Engineering Department, Cambridge University, 9 JJ Thomson Avenue, Cambridge, CB3 0FA, UK
2
IMPMC, Universités Paris 6 et 7, CNRS, IPGP, 140 rue de Lourmel, 75015 Paris, France
Corresponding author: acf26@eng.cam.ac.uk
We review the optical phonon dispersions of graphene. In
particular, we focus on the presence of two Kohn anomalies in the
highest optical phonon branch at the 
and 
points
of the Brillouin zone. We then show how graphene can be used as a
model for the calculation of phonons in carbon nanotubes. Finally,
we present the beyond Born-Oppenheimer corrections to their phonon
dispersions. These are experimentally revealed in the Raman spectra
of doped samples.
© EDP Sciences, Springer-Verlag, 2007
