Phonon switching and combined Fano-Rice effect in optical spectra of bilayer graphene

Details Phonon switching and combined Fano-Rice effect in optical spectra of bilayer graphene Phonon switching and combined Fano-Rice effect in optical spectra of bilayer graphene

2010-03-09

arxiv.org/abs/1003.1936v2

Phys. Rev. B 82, 041402(R) (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

final version

Scientific paper

10.1103/PhysRevB.82.041402

Recent infrared measurements of phonon peaks in gated bilayer graphene reveal two striking signatures of electron-phonon interaction: an asymmetric Fano lineshape and a giant variation of the peak intensity as a function of the applied gate voltage. In this Letter we provide a unified theoretical framework which accounts for both these effects and unveils the occurrence of a switching mechanism between the symmetric ($E_g$) and anti-symmetric ($E_u$) phonon mode as dominant channel in the optical response. A complete phase diagram of the optical phonon response is also presented, as a function of both the charge density and the bandgap.

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