Phonon anharmonicities in graphite and graphene

Details Phonon anharmonicities in graphite and graphene Phonon anharmonicities in graphite and graphene

2007-08-31

arxiv.org/abs/0708.4259v2

Phys. Rev. Lett. 99, 176802 (2007)

Physics

Condensed Matter

Materials Science

5 pages, 4 figures; typos corrected and reference added

Scientific paper

10.1103/PhysRevLett.99.176802

We determine from first-principles the finite-temperature properties--linewidths, line shifts, and lifetimes--of the key vibrational modes that dominate inelastic losses in graphitic materials. In graphite, the phonon linewidth of the Raman-active E2g mode is found to decrease with temperature; such anomalous behavior is driven entirely by electron-phonon interactions, and does not appear in the nearly-degenerate infrared-active E1u mode. In graphene, the phonon anharmonic lifetimes and decay channels of the A'1 mode at K dominate over E2g at G and couple strongly with acoustic phonons, highlighting how ballistic transport in carbon-based interconnects requires careful engineering of phonon decays and thermalization.

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