Heber Michael, Wind Nils, Kutnyakhov Dmytro, Pressacco Federico, Arion Tiberiu, Roth Friedrich, Eberhardt Wolfgang, Rossnagel Kai
Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany.
Institut für Experimental Physik, Universität Hamburg, 22761 Hamburg, Germany.
Rev Sci Instrum. 2022 Aug 1;93(8):083905. doi: 10.1063/5.0091003.
A 790-nm-driven high-harmonic generation source with a repetition rate of 6 kHz is combined with a toroidal-grating monochromator and a high-detection-efficiency photoelectron time-of-flight momentum microscope to enable time- and momentum-resolved photoemission spectroscopy over a spectral range of 23.6-45.5 eV with sub-100 fs time resolution. Three-dimensional (3D) Fermi surface mapping is demonstrated on graphene-covered Ir(111) with energy and momentum resolutions of ≲100 meV and ≲0.1 Å, respectively. The tabletop experiment sets the stage for measuring the k-dependent ultrafast dynamics of 3D electronic structure, including band structure, Fermi surface, and carrier dynamics in 3D materials as well as 3D orbital dynamics in molecular layers.
一个重复频率为6千赫兹、由790纳米驱动的高谐波产生源与一个环形光栅单色仪和一个高探测效率的光电子飞行时间动量显微镜相结合，能够在23.6 - 45.5电子伏特的光谱范围内进行具有亚100飞秒时间分辨率的时间和动量分辨光电子能谱。在覆盖石墨烯的Ir(111)上展示了三维（3D）费米面映射，其能量分辨率和动量分辨率分别约为100毫电子伏特和约0.1埃。该桌面实验为测量三维电子结构的与波矢相关的超快动力学奠定了基础，包括三维材料中的能带结构、费米面和载流子动力学以及分子层中的三维轨道动力学。
