发表机构
Norfolk State University（诺福克州立大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过坡莫合金薄膜的光电压动力学实验，发现超快光激发热电子主导了等离激元和磁性材料中的光致电效应，远超电磁动量转移预测。
AI 中文摘要
在脉冲激光照射下，等离激元和磁性材料中的光致电效应比电磁动量转移机制的预测高出数个数量级。为了更深入地了解该效应的本质，我们研究了不同光激发构型下坡莫合金薄膜中光电压的动力学过程。光致电信号由与磁性相关和与磁性无关的两个分量组成，这些分量具有显著的幅度，并且主要跟随激光脉冲的时间轮廓。相比之下，从反常能斯特效应预测的贡献要弱得多，且表现出明显更慢的动力学过程。这些观察结果表明，超快光激发热电子而非热机制在产生所观察到的光电压中起主导作用。
英文摘要
Photoinduced electric effects in plasmonic and magnetic materials under pulsed laser illumination exceed the prediction of the electromagnetic momentum-transfer mechanism by orders of magnitude. In order to get more information on the nature of the effect we study the kinetics of photovoltages in permalloy thin films at different photoexcitation configurations. The photoinduced electric signals consist of magnetically dependent and magnetically independent components which are of significant magnitude and mainly follow the temporal profile of the laser pulse. In contrast, the predicted contribution from the Anomalous Nernst Effect is much weaker and exhibits substantially slower kinetics. These observations suggest that ultrafast photoexcited hot electrons, rather than thermal mechanisms, play the dominant role in generating the observed photovoltage.
Comments12 pages, 6 figures
