Year: 2009
Type: article
Abstract: 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 $\ensuremath{\Gamma}$ 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.
Source: Physical Review B
Authors: A. Das, B. Chakraborty, S. Piscanec, S. Pisana, A. K. Sood, A. C. Ferrari
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Funders: Leverhulme Trust, Royal Society
OpenAlex ID: W2028015891