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 ≲0.1A˚−1, respectively. The table-top experiment sets the stage for measuring the kz-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.
@article{arxiv.2203.11121,
title = {Multispectral time-resolved energy-momentum microscopy using high-harmonic extreme ultraviolet radiation},
author = {Michael Heber and Nils Wind and Dmytro Kutnyakhov and Federico Pressacco and Tiberiu Arion and Friedrich Roth and Wolfgang Eberhardt and Kai Rossnagel},
journal= {arXiv preprint arXiv:2203.11121},
year = {2022}
}