论文标题
Au的电子能量光谱（111）在高矩
Electromagnetic dressing of the electron energy spectrum of Au(111) at high momenta
论文作者
论文摘要
通过电磁敷料对量子材料的轻度工程被认为是一种按需定制电子带分散的方法，甚至诱导拓扑相变。对于探测这种穿着的带，光发射光谱是一种理想的工具，我们在这里采用了基于超快光发射动量显微镜的新型实验。使用此设置，我们测量了来自AU（111）表面的电磁侧面侧带的平面动量依赖性强度指纹，用于S-和P旋转红外线驱动。我们发现，在金属表面上，由于筛选驱动激光器，Floquet-Bloch带的贡献可以忽略不计，并且穿着的频带以激光辅助的光电效应为主。同样，我们发现与一般期望相反，S偏振光可以在大型光电子神臂上打扮自由电子状态。我们的结果表明，当使用光发射识别光设计的电子带结构时，必须仔细考虑材料的介电响应。
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.
