Kohn Anomalies and Electron-Phonon Interaction in Graphite

Details Kohn Anomalies and Electron-Phonon Interaction in Graphite Kohn Anomalies and Electron-Phonon Interaction in Graphite

2004-07-07

arxiv.org/abs/cond-mat/0407164v2

Phys Rev Lett 93, 185503 (2004)

Physics

Condensed Matter

Materials Science

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.93.185503

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, whilst they are negligible for all the other modes at Gamma and K.

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