The phonon dispersion of graphite revisited

The phonon dispersion of graphite revisited

We review calculations and measurements of the phonon-dispersion relation of graphite. First-principles calculations using density-functional theory are generally in good agreement with the experimental data since the long-range character of the dynamical matrix is properly taken into account. Calculations with a plane-wave basis demonstrate that for the in-plane optical modes, the generalized-...

Phonon dispersion in graphite.

We measured the dispersion of the graphite optical phonons in the in-plane Brillouin zone by inelastic x-ray scattering. The longitudinal and transverse optical branches cross along the Gamma-K as well as the Gamma-M direction. The dispersion of the optical phonons was, in general, stronger than expected from the literature. At the K point the transverse optical mode has a minimum and is only a...

An investigation of electron-phonon coupling via phonon dispersion measurements in graphite using angle-resolved photoelectron spectroscopy

Electron-phonon coupling (EPC) plays an important role in solid state physics. Here, we demonstrate an experimental method that enables investigation of the elemental processes of the indirect transition, in which EPC participates in photoexcitation in solids, by resolving the energy and momentum of phonons and electrons simultaneously. For graphite, we used angle-resolved photoelectron spectro...

Determination of two-dimensional phonon dispersion relation of graphite by Raman spectroscopy

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

A. Grüneis,1,2 J. Serrano,3 A. Bosak,4 M. Lazzeri,5 S. L. Molodtsov,6 L. Wirtz,7 C. Attaccalite,8 M. Krisch,4 A. Rubio,8,9 F. Mauri,5 and T. Pichler1 1Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria 2IFW–Dresden, P.O. Box 270116, D-01171 Dresden, Germany 3ICREA–Departamento de Fisica Aplicada, Universitat Politecnica de Catalunya, EPSC, Av. Esteve Terradas 15,...