%0 Journal Article
%T Optical characterization of electron-phonon interactions at the saddle point in graphene
%A Adam T. Roberts
%A Rolf Binder
%A Nai H. Kwong
%A Dheeraj Golla
%A Daniel Cormode
%A Brian J. LeRoy
%A Henry O. Everitt
%A Arvinder Sandhu
%J Physics
%D 2013
%I arXiv
%R 10.1103/PhysRevLett.112.187401
%X The role of electron-phonon interactions is experimentally and theoretically investigated near the saddle point absorption peak of graphene. The differential optical transmission spectra of multiple, non-interacting layers of graphene reveals the dominant role played by electron-acoustic phonon coupling in bandstructure renormalization. Using a Born approximation for electron-phonon coupling and experimental estimates of the dynamic phonon lattice temperature, we deduce the effective acoustic deformation potential to be $D^{\rm ac}_{\rm eff} \simeq 5$eV. This value is in accord with recent theoretical predictions but differs substantially from those obtained using electrical transport measurements.
%U http://arxiv.org/abs/1310.2683v1