Time-resolved ARPES at LACUS: band structure and ultrafast electron dynamics of solids

This record contains the first experimental results obtained at the time-resolved ARPES endstation developed at the Lausanne Centre for Ultrafast Science. The use of VUV photons, generated by means of high-harmonic generation in gas, allows us to explore the out-of-equilibrium electron dynamics over the entire Brillouin zone of solids. In this work we give evidence of this capability by accessing the linearly dispersing surface state of the nodal-line Dirac semimetal ZrSiTe.

本数据集包含洛桑超快科学中心（Lausanne Centre for Ultrafast Science）搭建的时间分辨角分辨光电子能谱（time-resolved Angle-Resolved Photoemission Spectroscopy, ARPES）终端站所获得的首批实验结果。研究采用气体中高次谐波产生（high-harmonic generation）手段产生的真空紫外（VUV, Vacuum Ultraviolet）光子，得以探测固体整个布里渊区（Brillouin zone）内的非平衡电子动力学过程。本研究通过对节线狄拉克半金属（nodal-line Dirac semimetal）ZrSiTe的线性色散表面态进行表征，证实了该终端站的上述实验能力。