Coupled plasmon - phonon excitations in extrinsic monolayer graphene

Abstract

The existence of an acoustic plasmon in extrinsic (doped or gated) monolayer graphene was found recently in an {\it ab initio} calculation with the frozen lattice [M. Pisarra {\it et al.}, arXiv:1306.6273, 2013]. By the {\em fully dynamic} density-functional perturbation theory approach, we demonstrate a strong coupling of the acoustic plasmonic mode to lattice vibrations. Thereby, the acoustic plasmon in graphene does not exist as an isolated excitation, but it is rather bound into a combined plasmon-phonon mode. We show that the coupling provides a mechanism for the {\em bidirectional} energy exchange between the electronic and the ionic subsystems with fundamentally, as well as practically, important implications for the lattice cooling and heating by electrons in graphene.

5 pages, 4 figures

References in corpus (8)

• The electronic properties of graphene
• Dielectric function, screening, and plasmons in 2D graphene
• Mid-infrared plasmons in scaled graphene nanostructures
• Photocurrent in graphene harnessed by tunable intrinsic plasmons
• Velocity Renormalization and Carrier Lifetime in Graphene from Electron-Phonon Interaction
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• A method to restore the intrinsic dielectric functions of 2D materials in periodic calculations and its applications to the dielectric and optical properties of ultrathin h-BN and MoS2
• Dynamical theory of angle-resolved electron energy loss and gain spectroscopies of phonons and magnons in transmission electron microscopy including multiple scattering effects
• Negative static permittivity and violation of Kramers-Kronig relations in quasi-two-dimensional crystals
• Combined effect of doping and temperature on the anisotropy of low-energy plasmons in monolayer graphene