Ultrafast Electron-Phonon Decoupling in Graphite

Details Ultrafast Electron-Phonon Decoupling in Graphite Ultrafast Electron-Phonon Decoupling in Graphite

2007-12-12

arxiv.org/abs/0712.1879v1

Phys. Rev. B 77, 121402(R) (2008)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.77.121402

We report the ultrafast dynamics of the 47.4 THz coherent phonons of graphite interacting with a photoinduced non-equilibrium 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 non-adiabatic electron-phonon interaction by creating the non-equilibrium electron-hole plasma. Time-resolved vibrational spectroscopy provides a window on the ultrafast non-equilibrium electron dynamics.

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