4.6 Article

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

Journal

PHYSICAL REVIEW B
Volume 80, Issue 12, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.121403

Keywords

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Funding

  1. Nanoscale Science and Engineering Initiative of the NSF [CHE0117752, ECS-05-07111]
  2. New York State Office of Science, Technology, and Academic Research (NYSTAR)
  3. Chemical Sciences, Geosciences, and Biosciences Division
  4. Office of Basic Sciences
  5. Office of Science, U. S. Department of Energy the Office of Basic Energy Sciences
  6. Alexander-von-Humboldt Foundation

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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.

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