Gate tunable infrared phonon anomalies in bilayer graphene.

  title={Gate tunable infrared phonon anomalies in bilayer graphene.},
  author={Alexey B. Kuzmenko and L Benfatto and Emmanuele Cappelluti and Iris Crassee and Dirk van der Marel and Peter Blake and K S Novoselov and Andre K Geim},
  journal={Physical review letters},
  volume={103 11},
We observe a giant increase of the infrared intensity and a softening of the in-plane antisymmetric phonon mode E(u) ( approximately 0.2 eV) in bilayer graphene as a function of the gate-induced doping. The phonon peak has a pronounced Fano-like asymmetry. We suggest that the intensity growth and the softening originate from the coupling of the phonon mode to the narrow electronic transition between parallel bands of the same character, while the asymmetry is due to the interaction with the… CONTINUE READING
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