Impact of the electron-electron correlation on phonon dispersions: failure of LDA and GGA functionals in graphene and graphite

Abstract

We compute electron-phonon coupling (EPC) of selected phonon modes in graphene and graphite using various ab-initio methods. The inclusion of non-local exchange-correlation effects within the GW approach strongly renormalizes the square EPC of the A${}_1^{\prime }$ {\bf K} mode by almost 80 with respect to density functional theory in the LDA and GGA approximations. Within GW, the phonon slope of the A${}_1^{\prime }$ {\bf K} mode is almost two times larger than in GGA and LDA, in agreement with phonon dispersions from inelastic x-ray scattering and Raman spectroscopy. The hybrid B3LYP functional overestimates the EPC at {\bf K} by about 30%. Within the Hartree-Fock approximation, the graphene structure displays an instability under a distortion following the A${}_1^{\prime }$ phonon at {\bf K}.

Accepted for publication by Phys. Rev. B (Rapid Communications)

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