High resolution time- and angle-resolved photoemission spectroscopy with 11 eV laser pulses

Area of Science:

• Condensed Matter Physics
• Ultrafast Spectroscopy
• Materials Science

Background:

• Time- and angle-resolved photoemission spectroscopy (tr-ARPES) is crucial for studying electron dynamics in solids.
• Existing setups using high harmonic generation (HHG) require high pulse energies and offer limited energy resolution.

Purpose of the Study:

• To present a novel 11 eV tr-ARPES setup with enhanced performance.
• To enable high-resolution studies of non-equilibrium band structures.

Main Methods:

• Development of a novel 11 eV tr-ARPES system.
• Utilizing high harmonic generation (HHG) with reduced input pulse energies.
• Achieving high photon flux and high repetition rates.

Main Results:

• Unprecedented energy resolution of 16 meV achieved.
• High photon flux of 5 × 10¹⁰ photons/s generated.
• Operation at high repetition rates (up to 250 kHz) with low input pulse energies (down to 3 µJ).
• Simultaneous capture of dynamics in multiple momentum regions of ErTe₃.

Conclusions:

• The novel tr-ARPES setup offers superior energy and time resolution.
• Enables advanced investigations into non-equilibrium electronic properties of materials.
• Facilitates high-repetition-rate studies of ultrafast phenomena in solids.