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 in the peak intensity as a function of the applied gate voltage. In this Rapid Communication we provide a unified theoretical framework which accounts for both these effects and unveils the occurrence of a switching mechanism between symmetric (E-g) and antisymmetric (E-u) phonon modes 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 band gap.
Phonon switching and combined Fano-Rice effect in optical spectra of bilayer graphene / Cappelluti, E.; Benfatto, L.; Kuzmenko, A. B.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 82:4(2010). [10.1103/PhysRevB.82.041402]
Phonon switching and combined Fano-Rice effect in optical spectra of bilayer graphene
Cappelluti E.;Benfatto L.;
2010
Abstract
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 in the peak intensity as a function of the applied gate voltage. In this Rapid Communication we provide a unified theoretical framework which accounts for both these effects and unveils the occurrence of a switching mechanism between symmetric (E-g) and antisymmetric (E-u) phonon modes 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 band gap.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
