Femtosecond laser-induced crystallization of amorphous Sb2Te3 film and coherent phonon spectroscopy characterization and optical injection of electron spins

Femtosecond laser-induced crystallization of amorphous Sb2Te3 film and coherent phonon spectroscopy characterization and optical injection of electron spins
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非晶 Sb2Te3 薄膜飞秒激光诱导结晶及相干声子光谱表征和电子自旋光注入

DOI:
10.1063/1.3633228
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发表时间:
2011-09
影响因子:
3.2
通讯作者:
Yiqun Wu
Yiqun Wu
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Ke Chen;Wenfang Wang;Huan Huang;Daoxin Yao;Yang Wang;Fuxi Gan;Tianshu Lai;Simian Li;Weiling Zhu;Yiqun Wu

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采用飞秒激光辐照结晶技术,将非晶Sb2Te3薄膜转化为结晶薄膜。利用敏感相干声子光谱(CPS)监测了非晶态Sb2Te3薄膜在原辐照点的结晶过程。CPS结果表明,与Sb2Te3晶体的特征声子模式(A1g1和Eg)对应的两个声子模式的振动强度随着激光辐照强度(LIF)的增加而增强,表明随着LIF的增加,晶体的结晶程度上升,飞秒激光辐照是一种良好的后处理技术。采用时间分辨圆极化泵浦探针光谱研究了激光诱导结晶Sb2Te3薄膜的电子自旋弛豫动力学。确实观察到自旋弛豫过程,证实了自旋相关的光学跃迁选择规则的有效性的理论预测和基于自旋光栅的自旋等离子体收集的瞬态光学探测方案的可行性。
A femtosecond laser-irradiated crystallizing technique is tried to convert amorphous Sb2Te3 film into crystalline film. Sensitive coherent phonon spectroscopy (CPS) is used to monitor the crystallization of amorphous Sb2Te3 film at the original irradiation site. The CPS reveals that the vibration strength of two phonon modes that correspond to the characteristic phonon modes (A1g1 and Eg) of crystalline Sb2Te3 enhances with increasing laser irradiation fluence (LIF), showing the rise of the degree of crystallization with LIF and that femtosecond laser irradiation is a good post-treatment technique. Time-resolved circularly polarized pump-probe spectroscopy is used to investigate electron spin relaxation dynamics of the laser-induced crystallized Sb2Te3 film. Spin relaxation process indeed is observed, confirming the theoretical predictions on the validity of spin-dependent optical transition selection rule and the feasibility of transient spin-grating-based optical detection scheme of spin-plasmon collect...
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