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Tailoring between network rigidity and nanosecond transient absorption in a-GexAs35-xSe65 thin films

机译:a-GexAs35-xSe65薄膜的网络刚度和纳秒瞬态吸收之间的调节

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In this Letter, we report the first observation of dramatic decrease in nanosecond (ns) pulsed laser-induced transient absorption (TA) in a-GexAs35-xSe65 thin films by tuning the amorphous network from floppy to rigid. Our results provide the direct experimental evidence of a self-trapped exciton mechanism, where trapping of the excitons occurs through bond rearrangements. Taken together, a rigid amorphous network with more constraints than degrees of freedom are unable to undergo any such bond rearrangements and results in weaker TA. However, we also demonstrate that excitation fluence can be effectively utilized as a simple tool to lift up enough constraints to introduce large TA even in rigid networks. Apart from this, we also show that TA is tunable with network rigidity as it blue-shifts when the mean coordination is increased from 2.35 to 2.6. (C) 2015 Optical Society of America
机译:在这封信中,我们报告了通过将非晶网络从软盘调整为刚性,在a-GexAs35-xSe65薄膜中纳秒(ns)脉冲激光诱导的瞬态吸收(TA)急剧下降的第一个观察结果。我们的结果提供了自陷阱激子机制的直接实验证据,其中通过键重排发生了激子的陷阱。综上所述,具有比自由度更多的约束的刚性无定形网络无法进行任何此类键重排,从而导致TA较弱。但是,我们也证明,即使在刚性网络中,激发通量也可以有效地用作简单的工具来提升足够的约束条件,以引入较大的TA。除此之外,我们还表明,当平均协调度从2.35增加到2.6时,TA会随着蓝移而具有网络刚性的可调性。 (C)2015年美国眼镜学会

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