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Observation of suppressed terahertz absorption in photoexcited graphene
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View: Figures


Image of FIG. 1.
FIG. 1.

Complex optical sheet conductivity of graphene from 0.2 to 2.1 THz, in units of e 2 /h. The measurement was performed at room temperature on monolayer CVD graphene on a quartz substrate (without optical excitation). A bare quartz substrate was used as a reference. The blue solid and dashed lines are the real ( ) and imaginary ( ) part of the conductivity, respectively. The data can be fit by the Drude model (thin black lines) with carrier scattering rate Γ = 3 THz. The inset shows a typical Raman spectrum of our CVD graphene (excitation wavelength 532 nm). The narrow Lorentzian line shape of the 2D mode confirms the monolayer thickness of the samples. The small D-mode signal indicates the high crystalline quality of the samples.

Image of FIG. 2.
FIG. 2.

(a) Transmission of the THz electric field with (blue) and without (orange) pump excitation, measured by chopping the THz generation beam. The dashed line, scaled by a factor of 10 for clarity, is the pump induced modulation of the transmitted electric field . The inset shows a zoomed-in view of the peak, indicating that corresponds to a pump-induced bleaching of the graphene sample. (b) Temporal dynamics of following optical pump excitation, measured by chopping the pump beam. The horizontal and vertical dashed lines are, respectively, the zero pump-probe delay time and the peak position of . Inset shows the temporal dynamics of the peak of (vertical dashed line in main panel). The red line is a single-exponential fit with time constant ps. The peak value of the signal corresponds to %.

Image of FIG. 3.
FIG. 3.

(a) Temporal dynamics of the real (upper panel) and imaginary (lower panel) parts of the differential THz conductivity of optically pumped monolayer graphene. The black solid line denotes zero pump-probe delay time. (b) Differential THz conductivity 1 ps after optical excitation (horizontal dashed lines in (a)). The filled and open circles denote the experimental real ( ) and imaginary ( ) parts of the conductivity, respectively.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Observation of suppressed terahertz absorption in photoexcited graphene