Observation of the Kohn anomaly near the K point of bilayer graphene

Details Observation of the Kohn anomaly near the K point of bilayer graphene Observation of the Kohn anomaly near the K point of bilayer graphene

2009-07-19

arxiv.org/abs/0907.3322v1

Phys. Rev. B 80, 241414(R) (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.80.241414

The dispersion of electrons and phonons near the K point of bilayer graphene was investigated in a resonant Raman study using different laser excitation energies in the near infrared and visible range. The electronic structure was analyzed within the tight-binding approximation, and the Slonczewski-Weiss-McClure (SWM) parameters were obtained from the analysis of the dispersive behavior of the Raman features. A softening of the phonon branches was observed near the K point, and results evidence the Kohn anomaly and the importance of considering electron-phonon and electron-electron interactions to correctly describe the phonon dispersion in graphene systems.

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