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Temperature dependence of ultrafast phonon dynamics in graphite

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Scheuch,  Martin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Fachbereich Physik, Freie Universität Berlin, Berlin, Germany;

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Kampfrath,  Tobias
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Fachbereich Physik, Freie Universität Berlin, Berlin, Germany;

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Wolf,  Martin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Fachbereich Physik, Freie Universität Berlin, Berlin, Germany;

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Frischkorn,  Christian
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Fachbereich Physik, Freie Universität Berlin, Berlin, Germany;

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APL_graphite_21.pdf
(Any fulltext), 366KB

1.3663867.pdf
(Publisher version), 611KB

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Citation

Scheuch, M., Kampfrath, T., Wolf, M., Volkmann, K. v., Frischkorn, C., & Perfetti, L. (2011). Temperature dependence of ultrafast phonon dynamics in graphite. Applied Physics Letters, 99(21): 211908. doi:10.1063/1.3663867.


Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-3E83-F
Abstract
Nonequilibrium optical phonons are generated in graphite following the excitation of electron-hole pairs with a femtosecond laser pulse. Their energy relaxation is probed by means of terahertz pulses. We find that the hot-phonon lifetime increases by a factor of 2 when the sample temperature decreases from 300 to 5 K. These results suggest that the energy relaxation in graphite at room temperature and above is dominated by the anharmonic decay of hot A1′ phonons at the K point into acoustic phonons with energies of about 10 meV.