11-eV laser system for high-resolution photoelectron spectroscopy

研究新型量子材料的电子结构和开发新的光谱方法需要极紫外激光器。台式高亮度高分辨率11-eV激光器将（i）实现实验室高分辨率角分辨光电子能谱，具有可变偏振和微米级束斑，用于新型过渡金属的尖端电子结构研究，金属二硫属化物体系，包括相关和拓扑材料、系统掺杂的化合物、单层和少层体系以及货车范德华异质结构，以及用于化学气相传输生长的块状过渡金属二硫属化物晶体的连续表征和优化，补充基于同步加速器的高分辨率角分辨光电子能谱以及基于自由电子激光和高次谐波产生的时间和角分辨光电子能谱研究，特别是，通过在射束时间之前预先筛选和表征样品来增加这些实验的有效性和效率，（iii）提供用于探索新测量概念的灵活的基于实验室的角度分辨光电子能谱设置，包括，例如，原位样品生长和原位电偏置的方法，以及（iv）为开发新的测量方法提供强大的激光光源，例如等离子体-固体界面的操作光谱学。

An extreme ultraviolet laser is requested for the investigation of the electronic structure of novel quantum materials and the development of new spectroscopic methods.The table-top high-brilliance high-resolution 11-eV laser shall(i) enable laboratory-based high-resolution angle-resolved photoelectron spectroscopy with variable polarization and a micron-scale beam spot for cutting-edge electronic structure studies of novel transition-metal dichalcogenide systems including correlated and topological materials, systematically doped compounds, mono- and few-layer systems, and van der Waals heterostructures, as well as for the continuous characterization and optimization of chemical vapor transport-grown bulk transition-metal dichalcogenide crystals,(ii) complement synchrotron-based high-resolution angle-resolved photoelectron spectroscopy as well as free-electron laser- and high-harmonic generation-based time-and angle-resolved photoelectron spectroscopy studies and, in particular, increase the effectiveness and efficiency of these experiments by pre-screening and characterization of samples prior to beamtimes,(iii) provide a flexible laboratory-based angle-resolved photoelectron spectroscopy setup for the exploration of new measurement concepts, including, for example, methods for in situ sample growth and in situ electrical biasing, and(iv) make available a powerful laser light source for the development of new measurement methods, such as in operando spectroscopy of plasma-solid interfaces.