11-eV laser system for high-resolution photoelectron spectroscopy

为了研究新型量子材料的电子结构和发展新的光谱方法，需要一台极紫外光激光器。这台台式高亮度高分辨率11 eV激光器将(I)实现基于实验室的具有可变极化和微米尺度束斑的高分辨率角分辨光电子能谱，用于新型过渡金属二卤化物系统的前沿电子结构研究，包括相关材料和拓扑材料、系统掺杂化合物、单层和几层系统以及van der Waals异质结构，以及用于化学气相传输生长的过渡金属二卤化物大块晶体的连续表征和优化，(Ii)补充基于同步加速器的高分辨率角度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度分辨光电子能谱研究，尤其是通过在光束时间之前预先筛选和表征样品来提高这些实验的有效性和效率，(Iii)为探索新的测量概念提供灵活的基于实验室的角度分辨光电子能谱装置，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，例如在等离子体-固体界面的操纵面光谱中。

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.