2024-03-28T15:48:36Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/73332016-02-16T03:13:14Zcom_10261_115com_10261_3col_10261_368
00925njm 22002777a 4500
dc
Ishioka, Kunie
author
Hase, Muneaki
author
Kitajima, Masahiro
author
Wirtz, Ludger
author
Rubio, Angel
author
Petek, Hrvoje
author
2008-03-12
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.
Physical Review B 77: 121402(R)(2008)
1098-0121
http://hdl.handle.net/10261/7333
10.1103/PhysRevB.77.121402
Ultrafast electron-phonon decoupling in graphite