Kohn anomalies and electron-phonon interactions in graphite.

By S. Piscanec, M. Lazzeri, F. Mauri, Andrea C. Ferrari, John Robertson. Physical Review Letters, 2004

702 citations recorded by the source corpus.

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.

Subfields: Materials Chemistry

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In Materials Chemistry

Citations in the corpus

Development of a universal stress sensor for graphene and carbon fibres (2011, background): “It comes from the transverse optical phonon branch (TO) around the K point of the Brillouin zon”
Raman Spectroscopy in Graphene-Based Systems: Prototypes for Nanoscience and Nanometrology (2012, neutral): “[44] in 2004, with the introduc-”
Breakdown of the adiabatic Born-Oppenheimer approximation in graphene. (2007, methodology): “−¯ hvF k, where k + K is the momentum of the Dirac Fermions, vF is the Fermi velocity and ¯ hvF = 5.52 eV uA, from density functional theory (DFT) calculations [ 25 ] (Fig. 3A).”