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Journal Article

Phonon surface mapping of graphite: Disentangling quasi-degenerate phonon dispersions

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Rubio,  Angel
Theory, Fritz Haber Institute, Max Planck Society;

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0904.3205v1.pdf
(Preprint), 480KB

Grueneis-PRB-80-085423-2009.pdf
(Any fulltext), 460KB

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Citation

Grüneis, A., Serrano, J., Bosak, A., Lazzeri, M., Molodtsov, S. L., Wirtz, L., et al. (2009). Phonon surface mapping of graphite: Disentangling quasi-degenerate phonon dispersions. Physical Review B, 80(8), 085423-1-085423-5. Retrieved from http://dx.doi.org/10.1103/PhysRevB.80.085423.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0010-F859-2
Abstract
The two-dimensional mapping of the phonon dispersions around the K point of graphite by inelastic x-ray scattering is provided. The present work resolves the longstanding issue related to the correct assignment of transverse and longitudinal phonon branches at K.We observe an almost degeneracy of the three TO-, LA-, and LO-derived phonon branches and a strong phonon trigonal warping. Correlation effects renormalize the Kohn anomaly of the TO mode, which exhibits a trigonal warping effect opposite to that of the electronic band structure. We determined the electron-phonon coupling constant to be 166 (eV/Å)2 in excellent agreement to GW calculations. These results are fundamental for understanding angle-resolved photoemission, doubleresonance Raman and transport measurements of graphene-based systems.