Phonon Dispersion in Graphite

2004/02/17 by Janina Maultzsch, J. Maultzsch, S. Reich +5 · 531 citations
Materials Science · #Brillouin scattering #Brillouin zone #Carbon Nanotubes in Composites #Condensed matter physics #Diamond and Carbon-based Materials Research #Dispersion (optics) #Graphene #Graphene research and applications #Graphite #Inelastic scattering #Laser #Materials science #Optics #Phonon #Physics #Quantum mechanics #Scattering #Transverse plane

paper · doi:10.1103/physrevlett.92.075501

published in Physical Review Letters 92(7), 075501 (American Physical Society)

openalex publication_date 2004/02/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

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 \ensuremathΓ\mathrm\text\ensuremath-K as well as the \ensuremathΓ\mathrm\text\ensuremath-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 \ensuremath≈70 cm^\ensuremath-1 higher in frequency than the longitudinal mode. We show that first-principles calculations describe very well the vibrational properties of graphene once the long-range character of the dynamical matrix is taken into account.

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