Kohn anomalies and electron-phonon interactions in graphite.

  title={Kohn anomalies and electron-phonon interactions in graphite.},
  author={Stefano Piscanec and Mauro Lazzeri and Francesco Mauri and Andrea C. Ferrari and Joseph Robertson},
  journal={Physical review letters},
  volume={93 18},
We demonstrate that graphite phonon dispersions have two Kohn anomalies at the Gamma-E(2g) and K-A'1 modes. The anomalies are revealed by two sharp kinks. By an exact analytic derivation, we show that the slope of these kinks is proportional to the square of the electron-phonon coupling (EPC). Thus, we can directly measure the EPC from the experimental dispersions. The Gamma-E(2g) and K-A'1 EPCs are particularly large, while they are negligible for all the other modes at Gamma and K. 
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