Abstract:

Ultrafast dynamics of photoinjected carriers is studied in graphene grown by CVD. A optical conductivity model including intra- and inter-band transitions is used to fit the untrafast dynamics. Multiple physical parameters are extracted. It is surprised to find that the scattering time of carriers is in sub-femtosecond time scale which is much less than currently adopted value between several and a few hundred of femtoseconds. Carrier density and energy dependence of the ultrafast dynamics is also studied. Results are briefly discussed.
 
 
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