Momentum microscopy of a holey nanostructure
Abstract
Momentum microscopy records the three-dimensional momentum distribution of photoelectrons emitted from a solid sample and, by utilizing sufficiently high photon energies in the ultraviolet spectral range, offers direct access to the electronic band structure of a material. By employing a pump-probe scheme, this method provides a femtosecond view of light-matter interaction and the subsequent relaxation and transport dynamics in a broad range of material systems. However, momentum microscopy has so far been mostly limited to flat and spatially extended surfaces. Photoelectron emission from different three-dimensional facets, in combination with inhomogeneous electric fields around these structures, makes the analysis of the momentum distribution significantly more challenging. Here, we extend the state-of-the-art to a substantially more complex structure and show that a careful analysis of the electron distribution recorded with a momentum microscope provides rich information about both the spatial and momentum distributions on a few-nm and few-mÅ−1 scale, respectively. Combined with prior knowledge of the three-dimensional structure, momentum-resolved photoelectrons can be assigned to nano-localized emission spots, permitting a new level of insight into spatio-temporal charge carrier dynamics.
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BibTeX
@misc{harland2026momentum,
title = {{Momentum microscopy of a holey nanostructure}},
author = {Kerstin Harland and Julia Altenburg and Xiaofei Wu and Zsuzsanna Pápa and Leon David Schwarz and Lina Hansen and Katrin Meier and Arvid Klösgen and Bert Hecht and Germann Hergert and Péter Dombi and Jer-Shing Huang and Jan Vogelsang},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.21958},
eprint = {2609.21958},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.21958},
}
RIS
TY - UNPB
TI - Momentum microscopy of a holey nanostructure
AU - Kerstin Harland
AU - Julia Altenburg
AU - Xiaofei Wu
AU - Zsuzsanna Pápa
AU - Leon David Schwarz
AU - Lina Hansen
AU - Katrin Meier
AU - Arvid Klösgen
AU - Bert Hecht
AU - Germann Hergert
AU - Péter Dombi
AU - Jer-Shing Huang
AU - Jan Vogelsang
PY - 2026
DA - 2026/09/18
PB - arXiv
DO - 10.48550/arxiv.2609.21958
UR - https://arxiv.org/abs/2609.21958
AB - Momentum microscopy records the three-dimensional momentum distribution of photoelectrons emitted from a solid sample and, by utilizing sufficiently high photon energies in the ultraviolet spectral range, offers direct access to the electronic band structure of a material. By employing a pump-probe scheme, this method provides a femtosecond view of light-matter interaction and the subsequent relaxation and transport dynamics in a broad range of material systems. However, momentum microscopy has so far been mostly limited to flat and spatially extended surfaces. Photoelectron emission from different three-dimensional facets, in combination with inhomogeneous electric fields around these structures, makes the analysis of the momentum distribution significantly more challenging. Here, we extend the state-of-the-art to a substantially more complex structure and show that a careful analysis of the electron distribution recorded with a momentum microscope provides rich information about both the spatial and momentum distributions on a few-nm and few-mÅ^−1 scale, respectively. Combined with prior knowledge of the three-dimensional structure, momentum-resolved photoelectrons can be assigned to nano-localized emission spots, permitting a new level of insight into spatio-temporal charge carrier dynamics.
ER -