Measurement of Ultrafast Carrier Dynamics in Epitaxial Graphene
By J. Dawlaty, S. Shivaraman, M. Chandrashekhar, Farhan Rana, M. Spencer. 2007
675 citations recorded by the source corpus.
Using ultrafast optical pump-probe spectroscopy, we have measured carrier relaxation times in epitaxial graphene layers grown on SiC wafers. We find two distinct time scales associated with the relaxation of nonequilibrium photogenerated carriers. An initial fast relaxation transient in the 70–120fs range is followed by a slower relaxation process in the 0.4–1.7ps range. The slower relaxation time is found to be inversely proportional to the degree of crystalline disorder in the graphene layers as measured by Raman spectroscopy. We relate the measured fast and slow time constants to carrier-carrier and carrier-phonon intraband and interband scattering processes in graphene.
Subfields: Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/84c7b735e4dc5bd435dad5c45aff8297a90de378
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In Materials Chemistry
Citations in the corpus
- A Tutorial on Nonlinear Photonic Applications of Carbon Nanotube and Graphene (2012, background): “tering processes in graphene, respectively [52], [53].”
- Dirac electronic states in graphene systems: optical spectroscopy studies (2010, background): “citations. Another class of optical experiments, which are not discussed here, concerns timeresolved studies andtherelated investigations ofcarrierdynamics. There are already few reports in this area [184, 185, 186, 187, 167, 188, 189, 190], which is likely to expand in the future. Investigations of”
- Monolayer graphene as a saturable absorber in a mode-locked laser (2010, background): “observation that larger crystal disorder results in shorter relaxation time (τ2) in expitaxial graphene [22], we observed that the 1‐4 layers graphene has longer relaxation time (both τ1 and τ2) than monolayer graphene even though it has stronger defect‐related D peak (i”
- Dimensional crossover of thermal transport in few-layer graphene. (2010, background): “The characteristic time for energy transfer from electrons to phonons is on the order of ph~10 -12 s [28].”