Abstract
AbstractUtilizing a femtosecond pump‐probe technique, ultrafast relaxation of plasmon‐like LO phonon‐plasmon coupled (LOPC) modes is studied. The time‐resolved reflectivity change exhibits strong mode beating between the LO phonon and the lower branch of the LOPC modes. It is revealed that the decay of the upper branch (or plasmon‐like mode) of the coupled modes is very rapid in time‐frequency space, explored by using wavelet analysis. The decay time of the plasmon‐like LOPC mode, which corresponds to the relaxation time τ, is obtained to be ∼ 79 fs and this time constant enables us to extract the electron mobility μ to be 2074 ± 200 cm2/Vs. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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