Time-resolved ARPES with probe energy of 6.0/7.2 eV and switchable resolution configuration

Area of Science:

• Condensed Matter Physics
• Materials Science
• Spectroscopy

Background:

• Time- and angle-resolved photoemission spectroscopy (TR-PES) is crucial for understanding ultrafast electronic dynamics.
• Existing TR-PES systems often face limitations in tunable photon energy and simultaneous high energy/temporal resolution.

Purpose of the Study:

• To present the design and performance of a novel UV probe laser source for TR-PES.
• To achieve high-resolution measurements with tunable photon energies and flexible resolution configurations.

Main Methods:

• Utilized nonlinear optical crystals (β-BaB2O4 and KBe2BO3F2) to generate a UV probe laser.
• Implemented two distinct resolution configurations for energy and temporal resolution optimization.
• Achieved tunable photon energies of 6.0 eV and 7.2 eV.

Main Results:

• Optimized energy resolution of 8.5 meV at 6.0 eV and 10 meV at 7.2 eV.
• Achieved temporal resolution of 72 fs at 6.0 eV and 185 fs at 7.2 eV.
• Demonstrated system performance on topological insulator MnBi2Te4 and excitonic insulator candidate Ta2NiSe5.

Conclusions:

• The developed TR-PES system offers a powerful and flexible platform for advanced material characterization.
• The system's validated performance opens new avenues for studying complex electronic phenomena.