RT info:eu-repo/semantics/article
T1 Phonon surface mapping of graphite: Disentangling quasi-degenerate phonon dispersions
A1 Serrano Gutiérrez, Jorge
AB 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, double-resonance Raman and transport measurements of graphene-based systems.
PB American Physical Society
YR 2009
FD 2009
LK https://uvadoc.uva.es/handle/10324/65290
UL https://uvadoc.uva.es/handle/10324/65290
LA eng
NO Phys. Rev. B 80, 085423 (2009)
DS UVaDOC
RD 22-nov-2024