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Updated: Jul 8, 2025
08:53
Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
Published on: October 9, 2012
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Time-resolved ARPES with tunable 12-21.6 eV XUV at 400 kHz repetition rate.
Famin Chen1,2, Ji Wang1,3, Mojun Pan1,2
1Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
The Review of Scientific Instruments
|December 11, 2023
Summary
This study introduces a tunable time-resolved and angle-resolved photoemission spectroscopy (trARPES) apparatus. The new system offers precise measurements of non-equilibrium electronic structures in solids using extreme ultraviolet light.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spectroscopy
Background:
- Time-resolved and angle-resolved photoemission spectroscopy (trARPES) is crucial for probing non-equilibrium electronic structures in solids.
- Existing trARPES systems often lack tunability in photon energy, limiting their application scope.
Purpose of the Study:
- To develop and characterize a novel trARPES apparatus with tunable extreme ultraviolet (XUV) photon energies.
- To demonstrate the capability of the apparatus for studying equilibrium and non-equilibrium electronic properties of materials.
Main Methods:
- Implementation of a trARPES system with selectable photon energies of 12, 16.8, and 21.6 eV at a 400 kHz repetition rate.
- Characterization of energy and temporal resolutions for each harmonic (104-157 meV, 154-276 fs).
- Measurement of photon flux on the sample (10^10-10^11 photons/s).
Main Results:
- Successful operation of the trARPES apparatus with distinct energy and temporal resolutions for each tunable photon energy.
- Validation of the setup through equilibrium and non-equilibrium ARPES measurements on topological materials Zr2Te2P and Bi2Se3.
- Demonstration of the significance of tunable XUV photon energy for obtaining comprehensive experimental results.
Conclusions:
- The developed trARPES apparatus provides a versatile platform for advanced studies of electronic structures.
- Tunable photon energy in trARPES is essential for optimizing measurements and revealing nuanced material properties.
- This instrument advances the investigation of dynamic electronic phenomena in solid-state systems.
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