Journal
PHYSICAL REVIEW B
Volume 79, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.155417
Keywords
conduction bands; doping; graphene; phonons; Raman spectra; valence bands
Funding
- Department of Science and Technology, India
- Pembroke College and the Maudslay society
- Royal Society
- European Research Council
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We report phonon renormalization in bilayer graphene as a function of doping. The Raman G peak stiffens and sharpens for both electron and hole doping as a result of the nonadiabatic Kohn anomaly at the Gamma point. The bilayer has two conduction and valence subbands, with splitting dependent on the interlayer coupling. This gives a change of slope in the variation of G peak position with doping which allows a direct measurement of the interlayer coupling strength.
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