论文标题
低电子密度drude材料对超快光照明的电子和热响应
The electronic and thermal response of low electron density Drude materials to ultrafast optical illumination
论文作者
论文摘要
许多低电子密度Drude（LEDD）材料（例如透明的氧化导电或氮化物）最近引起了作为替代等离子体材料和未来非线性光学材料的兴趣。但是，迄今为止，这些材料的电子，热和光学响应的系统理论尚未支持大量的实验研究。在这里，我们使用先前在高贵金属上下文中得出的技术超越了低电子密度drude材料的简单电磁建模，并为其电子和热响应提供了电子动力学模型。我们发现，与高贵金属相比，低电子密度使电子相互作用的动量保存更为重要，更复杂，更敏感。此外，我们发现由于筛选较弱，电子电子相互作用变得越来越有效。最重要的是，我们表明，低电子密度使电子热容量远小于贵金属中的电子热容量，从而使Ledd材料中的电子倾向于与贵金属相比更快，更快地冷却。尽管在这里我们专注于氧化锡（ITO），但我们的分析结果可以轻松地应用于任何LEDD材料。
Many low electron density Drude (LEDD) materials such as transparent conductive oxide or nitrides have recently attracted interest as alternative plasmonic materials and future nonlinear optical materials. However, the rapidly growing number of experimental studies has so far not been supported by a systematic theory of the electronic, thermal and optical response of these materials. Here, we use the techniques previously derived in the context of noble metals to go beyond a simple electromagnetic modelling of low electron density Drude materials and provide an electron dynamics model for their electronic and thermal response. We find that the low electron density makes momentum conservation in electron-phonon interactions more important, more complex and more sensitive to the temperatures compared with noble metals; moreover, we find that electron-electron interactions are becoming more effective due to the weaker screening. Most importantly, we show that the low electron density makes the electron heat capacity much smaller than in noble metals, such that the electrons in LEDD materials tend to heat up much more and cool down faster compared to noble metals. While here we focus on indium tin oxide (ITO), our analytic results can be easily applied to any LEDD materials.
