中文摘要：

利用二能级体系速率方程,推导了半导体中探测光探测到的法拉第旋转光谱的理论模型,发现电子-空穴对的复合对法拉第旋转信号随时间的衰减有重要影响,并利用该模型对GaAs量子阱中实验测得的法拉第旋转光谱进行拟合,得到GaAs量子阱材料中的电子自旋弛豫时间为73.5ps,而直接利用单指数进行拟合得到的电子自旋弛豫时间仅为51.3ps.因此,直接利用单指数对法拉第旋转光谱进行拟合得到电子自旋弛豫时间的传统做法是不准确的.

英文摘要：

Based on the rate equations of a two-level system,time-resolved Faraday rotation spectroscopy model was developed.It was found that the carrier recombination has strong effect on the decay of Faraday rotation signal.The model was also used to fit the Faraday rotation spectra measured in GaAs quantum wells.The electron spin relaxation time was obtained as 73.5 ps.However,the spin relaxation time was obtained only as 51.3 ps with the single exponent to fit the Faraday rotation spectra.Thus,the conventional method with the single exponent to fit the Faraday rotation spectra is inaccurate.