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Updated: Jun 30, 2025
08:53
Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
Published on: October 9, 2012
17.6K
High-resolution MHz time- and angle-resolved photoemission spectroscopy based on a tunable vacuum ultraviolet source
Lukas Hellbrück1,2,3, Michele Puppin3, Fei Guo4
1Institute of Physics, Laboratory for Ultrafast Microscopy and Electron Scattering (LUMES), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
The Review of Scientific Instruments
|March 22, 2024
Summary
We developed a new time- and angle-resolved photoemission spectroscopy (trARPES) system for ultrafast electronic band structure analysis. This advanced system achieves high time and energy resolution, enabling detailed studies of material dynamics.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Ultrafast Spectroscopy
Background:
- Time- and angle-resolved photoemission spectroscopy (trARPES) is crucial for mapping electronic band structures and their dynamics.
- Femtosecond timescales are essential for observing rapid electronic processes.
Purpose of the Study:
- To introduce a novel trARPES system utilizing a fiber-based femtosecond light source.
- To demonstrate the system's capability to access the complete first Brillouin zone.
- To showcase the system's performance with experimental data.
Main Methods:
- Development of a new trARPES system with a fiber-based femtosecond light source in the vacuum ultraviolet range.
- Integration with an extreme ultraviolet high harmonic generation beamline for tunable resolution.
- Acquisition of trARPES data on Au(111), polycrystalline Au, Bi2Se3, and TaTe2.
Main Results:
- Achieved an energy resolution of 21 meV.
- Demonstrated a time resolution of <360 fs.
- Operated at a high repetition rate of 1 MHz, enabling efficient data acquisition.
Conclusions:
- The new trARPES system provides high-resolution insights into electronic band structures and dynamics.
- The system's capabilities are suitable for studying a wide range of materials.
- The advanced technology facilitates detailed investigations of ultrafast phenomena in solids.
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