title: 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.
authors.affiliation: Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, D-12489 Berlin, Germany.
authors.forename: Markus
authors.initials: M
authors.lastname: Breusing
authors.forename: Claus
authors.initials: C
authors.lastname: Ropers
authors.forename: Thomas
authors.initials: T
authors.lastname: Elsaesser