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  Temperature dependence of ultrafast phonon dynamics in graphite

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.

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 Creators:
Scheuch, Martin1, 2, Author           
Kampfrath, Tobias1, 2, Author           
Wolf, Martin1, 2, Author           
Volkmann, Konrad von2, 3, Author           
Frischkorn, Christian1, 2, Author           
Perfetti, L.2, 4, Author
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2Fachbereich Physik, Freie Universität Berlin, Berlin, Germany, ou_persistent22              
3APE Angewandte Physik und Elektronik GmbH, Berlin, Germany , ou_persistent22              
4Laboratoire des Solides Irradiés, Ecole polytechnique, Palaiseau cedex, France , ou_persistent22              

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 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.

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Language(s): eng - English
 Dates: 2011
 Publication Status: Issued
 Pages: -
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 Rev. Type: Peer
 Identifiers: DOI: 10.1063/1.3663867
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Title: Applied Physics Letters
Source Genre: Journal
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Publ. Info: Melville, NY : American Institute of Physics
Pages: - Volume / Issue: 99 (21) Sequence Number: 211908 Start / End Page: - Identifier: ISSN: 0003-6951
CoNE: https://pure.mpg.de/cone/journals/resource/954922836223