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Ultrafast THz Faraday Rotation in Graphene

Terahertz (THz) Faraday rotation measurements were performed to investigate carrier dynamics in p-type CVD graphene. We used static and time-resolved polarization-sensitive THz transmission measurements in a magnetic field to probe free carriers in GaAs, InP and Graphene. Static measurements probe the equilibrium carrier density and momentum scattering rate. Time-resolved (optical pump/THz probe) measurements probe the change in these quantities following photoexcitation. In a typical CVD graphene sample we found that 0.5ps following photoexcitation with 1*10^13 photons/cm2 pulses at 800nm the effective hole scattering time decreased from 37fs to 34.5fs, while the carrier concentration increased from 2.0*10^12/cm2 to 2.04*10^12/cm2, leading to a transient decrease in the conductivity of the film.

preprint2014arXivOpen access
J. N. HeymanR. F. Foo KuneB. A. AlebachewM. D. NguyenJ. T. Robinson
cond-mat.mes-hallcond-mat.mtrl-sci
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J. N. HeymanR. F. Foo KuneB. A. AlebachewM. D. NguyenJ. T. Robinson

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