Phonon dispersion in graphite

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 exp...

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Veröffentlicht in:Physical review letters 2004-02, Vol.92 (7), p.075501-075501, Article 075501
Hauptverfasser: Maultzsch, J, Reich, S, Thomsen, C, Requardt, H, Ordejón, P
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Reich, S
Thomsen, C
Requardt, H
Ordejón, P
description 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 approximately 70 cm(-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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title Phonon dispersion in graphite
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