Time‐Resolved Photoemission Electron Microscopy on a ZnO Surface Using an Extreme Ultraviolet Attosecond Pulse Pair

• DOI: 10.1002/apxr.202300122
• Publication Date: 2023-12-04T03:23:12Z
• Authors: Jan Vogelsang; Lukas Wittenbecher; Sara Mikaelsson; Chen Guo; Ivan Sytcevich; Anne‐Lise Viotti; Cord L. Arnold; Anne L'Huillier; Anders Mikkelsen
• Keywords: Attosecond; Extreme ultraviolet; Ultraviolet; Photoemission electron microscopy

Abstract Electrons photoemitted by extreme ultraviolet attosecond pulses derive spatially from the first few atomic surface layers and energetically valence band highest orbitals. As a result, it is possible to probe emission dynamics narrow 2D region in presence of optical fields, as well obtain elemental specific information. However, combining this with spatially‐resolved imaging long‐standing challenge because large inherent spectral width pulses, difficulty making them at high repetition rates. Here, work demonstrates an interferometry experiment on zinc oxide (ZnO) using resolved photoelectrons. Photoemission electron microscopy combined near‐infrared pump ‐ laser spectroscopy instantaneous phase infrared field spatial resolution. Results show how core level states low binding energy ZnO are suited perform experiments. A distinct shift beat signal observed across focus which attributed wavefront differences between fields surface. This clear pathway for resolution scale regions opening up detailed understanding nanometric light‐matter interaction.