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碲镉汞深能级载流子弛豫时间的皮秒泵浦-探测研究

Keywords: 碲镉汞,深能级,驰豫时间,泵浦-探测

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Abstract:

采用皮秒泵浦-探测方法研究了碲镉汞材料中非平衡载流子动力学过程,发现其差分透射强度在经过饱和之后出现一个负的极小值,归结为深能级的再吸收过程.采用速率方程模型,并引入两个深能级弛豫时间常数,很好地拟合了差分透射强度的延时曲线.两个深能级弛豫时间常数的存在意味着同时存在两种不同类型的深能级,揭示了碲镉汞材料中深能级特性的复杂性.此外还研究了弛豫时间随泵浦脉冲能量的变化关系.

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