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Time derivatives of the transient reflectivity changes for obtained by electro-optic detection at 300 K. The inset shows their FT spectra.
Three-dimensional images of the electro-optic response obtained by the wavelet analysis. (a) and (b) . The beating pattern observed at is due to the two modes of the LO (8.75 THz) and the mode (7.9 THz).
(a) Time evolution of the peak intensity of the plasmonlike LOPC mode at 23 THz for , 20 THz for , and 16 THz for . The relaxation time is obtained by the decay curve of the peak intensity. (b) Carrier (electron) mobility extracted from the values of using plotted as the function of the total carrier density. The horizontal dotted line at represents the Hall mobility of GaAs measured without photodoping.
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