Au（111）高动量电子能谱的电磁修整
Electromagnetic dressing of the electron energy spectrum of Au(111) at high momenta
摘要：
通过电磁修整对量子材料进行光工程被认为是一种按需定制电子能带色散甚至诱导拓扑相变的方法。对于探测这样的修饰带，光电子能谱是一个理想的工具，我们在这里采用了一种新的实验的基础上超快光电子动量显微镜。使用这种装置，我们测量了来自Au（111）表面的s偏振和p偏振红外驱动的电磁修饰边带的面内动量依赖强度指纹。我们发现在金属表面，由于驱动激光的屏蔽，Floquet-Bloch带的贡献可以忽略不计，修饰带主要由激光辅助的光电效应决定。同时，我们发现与一般的预期相反，s-偏振光可以在大的光电子动量下修饰自由电子态。我们的研究结果表明，材料的介电响应时，必须仔细考虑使用光电子发射光工程电子能带结构的识别。
英文摘要：
Light-engineering of quantum materials via electromagnetic dressing is considered an on-demand approach for tailoring electronic band dispersions and even inducing topological phase transitions. For probing such dressed bands, photoemission spectroscopy is an ideal tool, and we employ here a novel experiment based on ultrafast photoemission momentum microscopy. Using this setup, we measure the in-plane momentum-dependent intensity fingerprints of the electromagnetically-dressed sidebands from a Au(111) surface for s- and p-polarized infrared driving. We find that at metal surfaces, due to screening of the driving laser, the contribution from Floquet-Bloch bands is negligible, and the dressed bands are dominated by the laser-assisted photoelectric effect. Also, we find that in contrast to general expectations, s-polarized light can dress free-electron states at large photoelectron momenta. Our results show that the dielectric response of the material must carefully be taken into account when using photoemission for the identification of light-engineered electronic band structures.
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