Phonon anharmonicities in graphite and graphene

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 E-2g 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 E-1u mode. In graphene, the phonon anharmonic lifetimes and decay channels of the A(1) mode at K dominate over E-2g at Gamma and couple strongly with acoustic phonons, highlighting how ballistic transport in carbon-based interconnects requires careful engineering of phonon decays and thermalization.


Published in:
Physical Review Letters, 99, 17, 176802
Year:
2007
ISSN:
0031-9007
Keywords:
Laboratories:




 Record created 2012-06-29, last modified 2018-03-17


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