Time-resolved momentum microscopy with a 1 MHz high-harmonic extreme ultraviolet beamline

Area of Science:

• Ultrafast spectroscopy
• Surface science
• Quantum materials

Background:

• Advancements in laser technology and photoelectron spectroscopy facilitate new experimental capabilities.
• High-repetition rate extreme ultraviolet (EUV) light sources are crucial for time-resolved studies.

Purpose of the Study:

• To present a novel setup for time-resolved momentum microscopy.
• To enable simultaneous measurement of electron kinetic energy and momentum over time.

Main Methods:

• Utilizing a 1 MHz femtosecond (fs) EUV table-top light source generating 26.5 eV photons.
• Implementing time-resolved momentum microscopy.
• Performing static and time-resolved measurements on graphene.

Main Results:

• The setup provides simultaneous access to temporal evolution of photoelectron kinetic energy and in-plane momentum.
• Demonstrated the capabilities and limitations of the new experimental approach using graphene.

Conclusions:

• The developed setup represents a new generation of time-resolved photoemission experiments.
• Offers valuable insights into electron dynamics with high temporal and spatial resolution.
• Highlights the potential for studying complex materials.