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Phys Rev Lett. 2004 Oct 29;93(18):185503. Epub 2004 Oct 28.

Kohn anomalies and electron-phonon interactions in graphite.

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  • 1Cambridge University, Engineering Department, Trumpington Street, Cambridge CB2 1PZ, United Kingdom.


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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