Momentum Microscope for time resolved Photoelectronpectroscopy

利用所要求的仪器，“超快动力学”研究小组(鲍尔小组)和“同步辐射固态研究”小组(罗斯纳格尔小组)的目标是对现有的时间和角度分辨光电发射基础设施进行最先进的更新。以下特征将所要求的脉冲显微镜与光电子能谱仪区分开来：在能量-动量空间中对固体的电子能带结构进行并行并因此有效的三维检测成为可能。此外，该仪器的设计允许在几微米范围内选择真实空间检测区域。最后，该仪器可以在真实空间显微镜模式下操作，因此可以在100纳米范围的空间分辨率上收集关于探测区域横向变化的补充信息。这些特性允许应用新的实验方法，特别是在局部二维材料中的超快过程的研究中，这在几年来已经成为两个小组的研究重点。更重要的是，它们使小组能够研究样品系统，而迄今为止可用的检测系统无法访问这些样品系统。有了所要求的仪器，这两个研究小组专门计划对下列部分已经获得资助的课题进行研究：过渡金属二卤化物中的电子结构动力学：拓扑材料中的准粒子耦合和二维异质结构；石墨烯和半导体中的PHZ强场过程；吸附表面系统的时间分辨轨道层析和低能光电子衍射；真实设备中的界面动力学。

With the requested instrument the research groups "Ultrafast Dynamics" (Bauer group) and "Solid State Research with Synchrotron Radiation" (Rossnagel group) aim for a state-of-the-art update of the exsisting infrastructure for time- and angle-resolved photoemission. The following features distinguish the requested impulse microscope from the photoelectron spectrometers, presently available in the groups: A parallel and therefore efficient three-dimensional detection of the electronic band structure of solids in energy-momentum space becomes possible. Additionally, the design of the instrument allows for the selection of a real-space detection region in the few micrometer range. Finally, the instrument can be operated in a real-space microscopy mode, so that complementary information on lateral variations in the probed area can be collected at a spatial resolution in the 100 nm range. These peculiarities allow to apply novel experimental approaches particularly in the study of ultrafast processes in topical two-dimensional materials, which since a few years has become a research focus of the two groups. Even more, they enable the groups the study of sample systems, which were not accessible with the so far available detection systems. With the requested instrument, the two research groups specifically plan studies of the following, partly already funded subjects: - Electronic structure dynamics in transition-metal dichalcogenides: - Quasi-particle couplings in topological materials and two-dimensional hetero-structures; - PHz strong-field processes in graphene and semiconducting transition-metal dichalcogenides; - Time-resolved orbital tomography and low-energy photoelectron diffraction of adsorbate-surface systems; - Interface dynamics in real devices.