利用简化的圆偏振光抽运-探测光谱模型研究GaAs高过超能量态电子自旋动力学
首发时间:2013-10-09
摘要:利用圆偏振光抽运-探测光谱研究室温下GaAs高过超能量态电子自旋动力学,发现同旋向圆偏振光抽运-探测光谱降到反旋向圆偏振光抽运-探测光谱之下的反常现象。同时考虑自旋依赖的带填充效应和带隙重整化效应,发展了简化的圆偏振光抽运-探测光谱模型,用于拟合实验数据,从而获得自旋弛豫时间,载流子复合时间,自旋依赖带填充和带隙重整化效应的强度系数等。利用拟合获得的参数可以详细解释光谱翻转的物理起源,发现自旋依赖的带填充效应和带隙重整化效应均对翻转光谱有贡献。
关键词: 圆偏振抽运-探测光谱 自旋弛豫动力学 自旋依赖带隙重整化效应 自旋依赖带填充效应
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Spin dynamics of electron with high excess energy in GaAs investigated by the simplified circularly dichromatic pump-probe model
Abstract:Time-resolved circularly polarized pump-probe spectroscopy is used to study the spin dynamics of electron with high excess energy in bulk GaAs at room temperature, an abnormal phenomenon that the curve taken from co-helicity circularly polarized pump-probe beam drops below the curve taken from cross-helicity circularly polarized pump-probe beam is observed. A simplified circularly dichromatic pump-probe model is further developed with both the spin-dependent band-filling and band-gap renormalization effects being taken into account, the model can be used to fit the scanning experimental traces to retrieve the spin relaxation time, carrier recombination time, intensity coefficient of spin-dependent band-filling and band-gap renormalization effects, etc. With the parameters retrieved from the experimental data, the physical origin of the spectrum reversal can be explained in detail, both of the spin-dependent band-filling and band-gap renormalization effects contribute to the reversal spectrum.
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利用简化的圆偏振光抽运-探测光谱模型研究GaAs高过超能量态电子自旋动力学
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