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Phonon dispersion in graphite.

J Maultzsch1, S Reich, C Thomsen

  • 1Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany.

Physical Review Letters
|March 5, 2004
PubMed
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We measured graphite optical phonon dispersion using inelastic X-ray scattering, finding stronger dispersion than previously reported. First-principles calculations accurately predict these vibrational properties when considering long-range interactions.

Area of Science:

  • Condensed matter physics
  • Materials science
  • Solid-state physics

Background:

  • Optical phonons govern thermal and electrical properties of materials.
  • Understanding phonon dispersion is crucial for predicting material behavior.

Purpose of the Study:

  • To experimentally measure the in-plane optical phonon dispersion in graphite.
  • To compare experimental results with theoretical predictions.

Main Methods:

  • Inelastic X-ray scattering (IXS) was employed to probe phonon excitations.
  • Measurements were conducted across the in-plane Brillouin zone.

Main Results:

  • Longitudinal and transverse optical phonon branches were observed to cross along Gamma-K and Gamma-M directions.

Related Experiment Videos

  • The measured phonon dispersion was generally stronger than literature values.
  • At the K point, the transverse optical mode showed a minimum, with a frequency difference of ~70 cm(-1) from the longitudinal mode.

    • Conclusions:

    • First-principles calculations, incorporating the long-range nature of the dynamical matrix, accurately describe graphite's vibrational properties.
    • The findings provide valuable data for theoretical models of phonon behavior in layered materials.