Effect of spin polarization on electron recombination dynamics in bulk intrinsic GaAs
Effect of spin polarization on electron recombination dynamics in bulk intrinsic GaAs
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自旋极化对块状本征 GaAs 中电子复合动力学的影响
DOI：
10.7498/aps.57.6593
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发表时间：
2008-10
期刊：
影响因子：
--
通讯作者：
Yu Hua-Liang
中科院分区：
文献类型：
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作者：
Lai Tian-Shu;Teng Li-Hua;Lin Wei-Zhu;Huang Zhi-Ling;Wen Jin-Hui;Yu Hua-Liang
时间分辨圆偏振和线偏振泵浦探针光谱用于研究自旋偏振和自旋非偏振电子的复合动力学及其在 9.6K 下本征 GaAs 的光子能量演化。研究发现自旋极化对电子复合动力学有显着影响。仅当在导带底部附近测量时，光谱测量才给出相同的复合寿命，但在较高的过剩能量状态下测量到不同的复合寿命。指出应使用圆偏振泵浦探针光谱测量的复合寿命，而不是线偏振泵浦探针光谱测量的复合寿命，来从时间分辨法拉第光谱数据中求解电子自旋相干寿命。理论计算与实验结果吻合较好。
Time-resolved circularly polarized and linearly polarized pump-probe spectroscopies are 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 electron recombination dynamics. The spectroscopic measurements give the same recombination lifetime only when measured near the bottom of the conduction band, but different recombination lifetimes were measured in higher excess-energy states. It is pointed out that the recombination lifetime measured by circularly polarized pump-probe spectroscopy, rather than that measured by 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.