Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-12-07
Phys. Rev. B 84, 241404(R) (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Accepted in Phys. Rev. B as a Rapid Communication. 5 pages, 3 figures, revised text with additional data
Scientific paper
10.1103/PhysRevB.84.241404
Graphene phonons are measured as a function of electron doping via the addition of potassium adatoms. In the low doping regime, the in-plane carbon G-peak hardens and narrows with increasing doping, analogous to the trend seen in graphene doped via the field-effect. At high dopings, beyond those accessible by the field-effect, the G-peak strongly softens and broadens. This is interpreted as a dynamic, non-adiabatic renormalization of the phonon self-energy. At dopings between the light and heavily doped regimes, we find a robust inhomogeneous phase where the potassium coverage is segregated into regions of high and low density. The phonon energies, linewidths and tunability are remarkably similar for 1-4 layer graphene, but significantly different to doped bulk graphite.
Dean Mark P. M.
Howard Christopher A.
Withers Freddie
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