Time-resolved Raman spectroscopy of optical phonons in graphite: Phonon anharmonic coupling and anomalous stiffening

Hugen Yan, Daohua Song, Kin Fai Mak, Ioannis Chatzakis, Janina Maultzsch, Tony F. Heinz

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93 Scopus citations

Abstract

Time-resolved Raman spectroscopy has been applied to probe the anharmonic coupling and electron-phonon interaction of optical phonons in graphite. From the decay of the transient anti-Stokes scattering of the G -mode following ultrafast excitation, we measured a lifetime of 2.2±0.1 ps for zone-center optical phonons. We also observed a transient stiffening of G -mode phonons, an effect attributed to the reduction of the electron-phonon coupling for high electronic temperatures.

Original languageEnglish
Article number121403
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number12
DOIs
StatePublished - Sep 17 2009

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