【摘 要】
：
Electron energy relaxation time τ is one of the key physical parameters for electronic materials.In this study,we develop a new technique to measure τ in a se
【机 构】
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Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences,
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Electron energy relaxation time τ is one of the key physical parameters for electronic materials.In this study,we develop a new technique to measure τ in a semiconductor via monochrome picosecond (ps) terahertz (THz) pump and probe experiment.The special THz pulse structure of Chinese THz free-electron laser (CTFEL) is utilized to realize such a technique,which can be applied to the investigation into THz dynamics of electronic and optoelectronic materials and devices.We measure the THz dynamical electronic properties of high-mobility n-GaSb wafer at 1.2 THz,1.6 THz,and 2.4 THz at room temperature and in free space.The obtained electron energy relaxation time for n-GaSb is in line with that measured via,e.g.,four-wave mixing techniques.The major advantages of monochrome ps THz pump-probe in the study of electronic and optoelectronic materials are discussed in comparison with other ultrafast optoelectronic techniques.This work is relevant to the application of pulsed THz flee-electron lasers and also to the development of advanced ultrafast measurement technique for the investigation of dynamical properties of electronic and optoelectronic materials.
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