Electron-Phonon Interactions in Bilayer Graphene: A First Principles Approach

Details Electron-Phonon Interactions in Bilayer Graphene: A First Principles Approach Electron-Phonon Interactions in Bilayer Graphene: A First Principles Approach

2010-11-24

arxiv.org/abs/1011.5521v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 4 figures

Scientific paper

Density functional perturbation theory is used to analyze electron-phonon interaction in bilayer graphene. The results show that phonon scattering in bilayer graphene bears more resemblance with bulk graphite than monolayer graphene. In particular, electron-phonon scattering in the lowest conduction band is dominated by six lowest (acoustic and acoustic-like) phonon branches with only minor contributions from optical modes. The total scattering rate at low/moderate electron energies can be described by a simple two-phonon model in the deformation potential approximation with effective constants Dac $\approx$ 15 eV and Dop $\approx 2.8 \times 108$ eV/cm for acoustic and optical phonons, respectively. With much enhanced acoustic phonon scattering, the low field mobility of bilayer graphene is expected to be significantly smaller than that of monolayer graphene.

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