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

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

Book ID: 111655731
Publisher: The American Physical Society
Year: 2009
Tongue: English
Weight: 192 KB
Volume: 80
Category: Article
ISSN: 1098-0121
DOI: 10.1103/physrevb.80.121403

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Subpicosecond time-resolved transient grating experiments were performed in mercuric iodide, a wide bandgap semiconductor. Hot carriers created by two-photon absorption cooled within a few picoseconds to form the free exciton. The free exciton lifetime was 1.8 k 0.2 ns. Coherent Raman excitation of