Reference : Ultrafast electron-phonon decoupling in graphite
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/10993/10571
Ultrafast electron-phonon decoupling in graphite
English
Ishioka, Kunie [National Institute for Materials Science > Advanced Nano-Characterization Center]
Hase, Muneaki [National Institute for Materials Science > Advanced Nano-Characterization Center]
Kitajima, Masahiro [National Institute for Materials Science > Advanced Nano-Characterization Center]
Wirtz, Ludger mailto [CNRS UMR 8520 > Institute for Electronics, Microelectronics, and Nanotechnology]
Rubio, Angel [European Theoretical Spectroscopy Facility, Universidad del País Vasco, Centro Mixto CSIC-UPV/EHU and Donostia International Physics Center]
Petek, Hrvoje [Department of Physics and Astronomy, University of Pittsburgh and Donostia International Physics Center]
2008
Physical Review B
77
12
Yes (verified by ORBilu)
International
1098-0121
[en] We report the ultrafast dynamics of the 47.4 THz coherent phonons of graphite interacting with a photoinduced nonequilibrium electron-hole plasma. Unlike conventional materials, upon photoexcitation the phonon frequency of graphite upshifts, and within a few picoseconds relaxes to the stationary value. Our first-principles density functional calculations demonstrate that the phonon stiffening stems from the light-induced decoupling of the nonadiabatic electron-phonon interaction by creating a nonequilibrium electron-hole plasma. Time-resolved vibrational spectroscopy provides a window on the ultrafast nonquilibrium electron dynamics.
http://hdl.handle.net/10993/10571
10.1103/PhysRevB.77.121402

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