High-power ultrashort pulse laser system for simultaneous generation of ultrashort THz-pump and VUV-probe pulses

所要求的高功率超短脉冲激光系统与定制的真空紫外源相结合，将在多太赫兹频域提供相位稳定的亚周期泵浦脉冲和重复频率在10-200 kHz之间、光子能量在20-30 eV之间的真空紫外探测脉冲。基于我们最近对亚周期APRES(角度分辨光电子能谱)的实验，新系统将被用来在整个第一布里渊区的固体能带结构中首次制作由光波驱动的电子组成的飞秒慢动作薄膜。在各种各样的现代量子材料中，如石墨烯、过渡金属二氢化合物或拓扑绝缘体的表面态，超快电子动力学的新方面应该在相关的时间和能量尺度上绘制出来。例如，在固体的能带结构中观察到Bloch振荡和谷伪自旋的超快转换，或者研究强关联的电子系统。此外，高重复频率的高稳定激光系统对于测量原子薄固体或拓扑绝缘体表面态的高次谐波产生的微弱信号是必要的。在这些实验中，我们想要研究光波电子学和拓扑绝缘体上的自旋电子学，由Erwin Schrödinger从理论上预测了Zitterbewegung和拓扑非平凡量子路径的影响。最后，新的激光光源还将用于研究类似于黑洞Unruh-Hawking辐射的非绝热腔量子电动力学中的理论预测效应。所要求的激光光源是雷根斯堡大学探索凝聚态物质中出现的相对论效应的战略关键因素。因此，这些实验对合作研究中心和许多双边跨学科合作特别重要。

The requested high-power ultrashort pulse laser system together with a tailored vacuum ultraviolet source should provide phase-stable subcycle pump pulses in the multi-THz spectral domain and vacu-um ultraviolet probe pulses with photon energies between 20 and 30 eV at repetition rates between 10 and 200 kHz.Based on our recent experiments on subcycle-APRES (angle-resolved photoemission spectroscopy), the new system should be employed to make the first-ever femtosecond-slow-motion film of lightwave-driven electrons in the band structure of a solid over the entire first Brillouin zone. In a wide variety of modern quantum materials like graphene, transition metal dichal-cogenides or surface states of topological insulators, novel aspects of ultrafast electron dynamics should be mapped out, on the relevant time and energy scales. Examples are the observation of Bloch oscillations and the ultrafast switching of the valley pseudospin or the investigation of strongly corre-lated electron systems, in the band structure of the underlying solids. Additionally, the highly stable laser system with a high repetition rate is necessary to measure the weak signals that occur in high harmonic generation in atomically thin solids or surface states of topological insulators. During these experiments, we want to study lightwave electronics and spintronics on topological insulators, by Erwin Schrödinger theoretically predicted Zitterbewegung and the effects of topologically non-trivial quantum paths. Finally, the new laser source should also be used to investigate theoretically predicted effects in non-adiabatic cavity quantum electrodynamics similar to Unruh-Hawking radiation of black holes.The requested laser source is a strategic key element for the exploration of emergent relativistic ef-fects in condensed matter at the University of Regensburg. The experiments are, thus, especially rele-vant for the Collaborative Research Center and numerous bilateral interdisciplinary collabora-tions.