GaAs中轻、重空穴对电子自旋相干动力学的影响
首发时间:2013-09-30
摘要:研究了9.6K低温下、本征GaAs高过超能量态电子自旋相干动力学的浓度依赖,发现当光子能量为1.57eV, 载流子浓度较大时电子自旋相干量子拍的相位翻转180度. 理论计算表明量子拍的相位翻转为区分轻、重空穴系统提供了重要依据,当载流子浓度较大时,量子拍的振幅主要起源于重空穴价带-导带跃迁,反之,量子拍的振幅主要起源于轻空穴价带-导带跃迁。在轻空穴价带-导带系统实验测得的电子自旋相干弛豫时间明显大于在重空穴价带-导带系统测得的电子自旋相干弛豫时间,说明轻、重空穴对电子自旋相干弛豫动力学有不同影响。
关键词: 圆偏振光抽运-探测光谱 自旋相干动力学 浓度依赖 GaAs
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Effect of light and heavy hole on spin coherence dynamics of electron in GaAs
Abstract: Time-resolved circularly polarized pump-probe spectroscopy is used to study the carrier density dependence of the electron-spin coherence dynamics in intrinsic GaAs at 9.6K. It is found that the phase of the quantum beats is altered by 180 degree when the carrier density is increased with the photon energy of 1.57eV. Theoretical calculation shows that the phase reversal of quantum beats provides the key information to distinguish the heavy hole and light hole systems, when the carrier density is large, the quantum beats mainly originates from the heavy hole valance band-conduction band transitions, otherwise, the quantum beats mainly originates from the light hole valance band-conduction band transitions, thus spin coherence dynamics in heavy hole valance band- and light hole valance band-conduction band systems can be measured separately, the experimental data shows that spin coherence relaxation time measured in heavy hole valance band-conduction band system is larger than that measured in light hole valance band-conduction band system.
Keywords: circularly polarized pump-probe spectroscopy spin coherence dynamics density dependence GaAs
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