Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-08-13
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
6 pages and 6 figures
Scientific paper
Using optical-pump terahertz-probe spectroscopy, we study the relaxation dynamics of photoexcited carriers in graphene at different temperatures. We find that at lower temperatures the tail of the relaxation transients as measured by the differential probe transmission becomes slower, extending beyond several hundred picoseconds at temperatures below 50K. We interpret the observed relaxation transients as resulting from the cooling of the photoexcited carriers via phonon emission. The slow cooling of the photoexcited carriers at low temperatures is attributed to the bulk of the electron and hole energy distributions moving close enough to the Dirac point such that both intraband and interband scattering of carriers via optical phonon emission becomes inefficient for removing heat from the carriers. Our model, which includes intraband carrier scattering and interband carrier recombination and generation, agrees very well with the experimental observations.
Rana Farhan
Shields Virgil B.
Shivaraman Shriram
Spencer Michael G.
Strait Jared H.
No associations
LandOfFree
Very Slow Cooling Dynamics of Photoexcited Carriers in Graphene Observed by Optical-Pump Terahertz-Probe Spectroscopy does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Very Slow Cooling Dynamics of Photoexcited Carriers in Graphene Observed by Optical-Pump Terahertz-Probe Spectroscopy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Very Slow Cooling Dynamics of Photoexcited Carriers in Graphene Observed by Optical-Pump Terahertz-Probe Spectroscopy will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-635818