Momentum Microscope for time resolved Photoelectronpectroscopy

利用所需的仪器，“超快动力学”（Bauer小组）和“同步辐射固态研究”（Rossnagel小组）研究小组的目标是对现有的时间和角度分辨光发射基础设施进行最先进的更新。以下功能区分所需的脉冲显微镜从光电子能谱仪，目前可在组：一个并行的，因此有效的三维检测的电子能带结构的固体在能量动量空间成为可能。此外，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，该仪器可以在实空间显微镜模式下操作，从而可以在100 nm范围内的空间分辨率下收集关于探测区域中的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的超快过程的研究中，这几年来已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，这是迄今为止可用的检测系统无法访问的。利用所要求的仪器，两个研究小组具体计划研究以下部分已经资助的主题：-过渡金属二硫属化物的电子结构动力学：-拓扑材料和二维异质结构中的准粒子耦合; -石墨烯和半导体过渡金属二硫属化物中的PHz强场过程;- 吸附物-表面系统的时间分辨轨道层析成像和低能光电子衍射; -真实的装置中的界面动力学。

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.