本征GaAs中电子自旋极化对电子复合动力学的影响研究
首发时间:2008-03-10
摘要:采用时间分辨圆偏振光和线偏振光抽运-探测光谱,研究了9.6K温度下、本征GaAs中自旋极化电子与非极化电子的复合动力学及其随光子能量演化。发现自旋极化对电子复合动力学具有显著的影响。仅在导带底附近测量时,两种方法测试到的复合寿命一致,而在高过超能量电子态测量时,两种方法测试到的复合寿命不一致。指出时间分辨法拉第光谱中,用于反演求解电子自旋相干寿命的电子复合寿命应该使用圆偏振光抽运-探测获得的复合寿命,而不是线偏振光抽运-探测获得的寿命。理论计算与实验结果较好符合。
关键词: 圆偏振光抽运-探测光谱 自旋量子拍 自旋极化 GaAs
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Effect of spin polarization on electrons recombination dynamics in bulk intrinsic GaAs
Abstract:Time-resolved circularly polarized and linearly polarized pump-probe spectroscopy is used to study the recombination dynamics of spin-polarized and spin-nonpolarized electrons as well as its evolution with photon energy for an intrinsic GaAs at 9.6K. It is found that the spin polarization has a significant influence on the electronic recombination dynamics. The two spectroscopic measurements give a same recombination lifetime only measured near the bottom of the conduction band, but different recombination lifetimes as measured at a higher excess-energy state. It is pointed out that the recombination lifetime measured by circularly polarized pump-probe spectroscopy, instead of linearly-polarized pump-probe spectroscopy, should be used to solve for the lifetime of electron-spin coherence from time-resolved Faraday spectroscopic data. The theoretical calculation agrees well with the experimental results.
Keywords: circularly polarized pump-probe spectroscopy, spin quantum beat, spin polarization, GaAs
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No.1915420521012051****
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