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.
Ultrafast charge carrier dynamics in graphite has been investigated by time-resolved terahertz spectroscopy. Analysis of the transient dielectric function and model calculations...
Collection of two-dimensional infrared (2DIR) spectra using two ultrafast, broadband infrared pump pulses followed by an ultrafast probe pulse optimizes the experimental time an...
Through ultrafast pump-probe spectroscopy with intense pump pulses and a wide\ncontinuum probe, we show that interband exciton peaks in single-walled carbon\nnanotubes (SWNTs) a...
PbSe nanocrystal colloids exhibit a well-defined excitonic structure with the lowest energy exciton tuning from 0.5 to 1 eV, as a function of size. Band-edge fluorescence is obs...
Ultrafast photoinduced absorption by infrared-active vibrational modes (IRAV) is used to detect charged photoexcitations (polarons) in conjugated luminescent polymers. The exper...
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