Ultrafast Carrier Dynamics in Graphite
Abstract
Optical pump-probe spectroscopy with 7-fs pump pulses and a probe spectrum wider than 0.7 eV reveals the ultrafast carrier dynamics in freestanding thin graphite films. We discern for the first time a rapid intraband carrier equilibration within 30 fs, leaving the system with separated electron and hole chemical potentials. Phonon-mediated intraband cooling of electrons and holes occurs on a 100 fs time scale. The kinetics are in agreement with simulations based on Boltzmann equations.
- Publication:
-
Physical Review Letters
- Pub Date:
- February 2009
- DOI:
- 10.1103/PhysRevLett.102.086809
- Bibcode:
- 2009PhRvL.102h6809B
- Keywords:
-
- 81.05.Uw;
- 63.20.kd;
- 78.47.J-;
- 78.40.Kc;
- Carbon diamond graphite;
- Phonon-electron interactions;
- Ultrafast pump/probe spectroscopy;
- Metals semimetals and alloys