多孔纳米结构的动量显微术
Momentum microscopy of a holey nanostructure
- Carl von Ossietzky Universität Oldenburg（奥尔登堡卡尔·冯·奥西茨基大学）
- Leibniz Institute of Photonic Technology（莱布尼茨光子技术研究所）
- ELI ALPS, The Extreme Light Infrastructure ERIC（极轻基础设施欧洲研究联盟 ELI ALPS）
- Universität Würzburg（维尔茨堡大学）
- HUN‐REN Wigner Research Center for Physics（匈牙利科学院维格纳物理研究中心）
- Friedrich-Schiller-Universität Jena（耶拿弗里德里希·席勒大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文利用动量显微术分析多孔纳米结构的光电子动量分布，结合三维结构先验知识，将动量分辨光电子归属至纳米局域发射点，实现对时空电荷载流子动力学的新洞察。
AI中文摘要：
动量显微术记录从固体样品发射的光电子的三维动量分布，并通过利用紫外光谱范围内足够高的光子能量，直接提供材料的电子能带结构信息。通过采用泵浦-探测方案，该方法能够以飞秒时间尺度观察光与物质相互作用以及随后在广泛材料系统中的弛豫和输运动力学。然而，迄今为止，动量显微术主要局限于平坦且空间延展的表面。来自不同三维晶面的光电子发射，结合这些结构周围的不均匀电场，使得动量分布的分析变得显著更具挑战性。在此，我们将现有技术水平扩展到一种更为复杂的结构，并表明对动量显微镜记录的电子分布进行仔细分析，能够分别提供关于纳米尺度和几毫埃逆尺度（mÅ$^{-1}$）空间与动量分布的丰富信息。结合对三维结构的先验知识，动量分辨的光电子可以被归属到纳米局域的发射点，从而为时空电荷载流子动力学提供新的洞察水平。
英文摘要：
Momentum microscopy records the three-dimensional momentum distribution of photoelectrons emitted from a solid sample and, by utilizing sufficiently high photon energies in the ultraviolet spectral range, offers direct access to the electronic band structure of a material. By employing a pump-probe scheme, this method provides a femtosecond view of light-matter interaction and the subsequent relaxation and transport dynamics in a broad range of material systems. However, momentum microscopy has so far been mostly limited to flat and spatially extended surfaces. Photoelectron emission from different three-dimensional facets, in combination with inhomogeneous electric fields around these structures, makes the analysis of the momentum distribution significantly more challenging. Here, we extend the state-of-the-art to a substantially more complex structure and show that a careful analysis of the electron distribution recorded with a momentum microscope provides rich information about both the spatial and momentum distributions on a few-nm and few-mÅ$^{-1}$ scale, respectively. Combined with prior knowledge of the three-dimensional structure, momentum-resolved photoelectrons can be assigned to nano-localized emission spots, permitting a new level of insight into spatio-temporal charge carrier dynamics.
