Infrared phonon activity in pristine graphite
نویسندگان
چکیده
منابع مشابه
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...
متن کاملPhonon linewidths and electron-phonon coupling in graphite and nanotubes
We show that electron-phonon coupling EPC is the major source of broadening for the Raman G and G− peaks in graphite and metallic nanotubes. This allows us to directly measure the optical-phonon EPCs from the G and G− linewidths. The experimental EPCs compare extremely well with those from the density functional theory. We show that the EPC explains the difference in the Raman spectra of metall...
متن کاملPhonon 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,...
متن کاملThe 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-...
متن کاملTemperature Dependence of Ultrafast Phonon Dynamics in Graphite
Nonequilibrium optical phonons are generated in graphite following the excitation of electron-hole pairs with a femtosecond laser pulse. Their energy relaxation is probed by means of terahertz pulses. We find that the hot-phonon lifetime increases by a factor of 2 when the sample temperature decreases from 300 to 5 K. These results suggest that the energy relaxation in graphite at room temperat...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review B
سال: 2012
ISSN: 1098-0121,1550-235X
DOI: 10.1103/physrevb.86.054302