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

doi:10.1103/PhysRevB.80.121403

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

Physics

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113 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 language	English (US)
Article number	121403
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	80
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevB.80.121403
State	Published - Sep 17 2009

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.80.121403

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AU - Maultzsch, Janina

AU - Heinz, Tony F.

PY - 2009/9/17

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

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