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A versatile laser-based apparatus for time-resolved ARPES with micro-scale spatial resolution.

S K Y Dufresne^1,2, S Zhdanovich^1,2, M Michiardi^1,2

¹Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada.

The Review of Scientific Instruments

|March 22, 2024

Summary

This summary is machine-generated.

We developed a versatile time-resolved micro-ARPES system for studying ultrafast electron dynamics in challenging materials. This advanced technique offers high spatial, energy, and temporal resolution, enabling detailed analysis of exfoliated and inhomogeneous samples.

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Area of Science:

Condensed Matter Physics
Materials Science
Spectroscopy

Background:

Understanding electron dynamics is crucial for novel material applications.
Existing techniques often lack the spatial resolution for inhomogeneous or micro-scale samples.

Purpose of the Study:

To develop a versatile apparatus for time-resolved micro-ARPES.
To enable the study of ultrafast electron dynamics in exfoliated and inhomogeneous materials with micrometer spatial resolution.

Main Methods:

Development of a 6.2 eV laser-based time-resolved micro-ARPES system.
Achieved tunable spatial resolution down to ~11 μm.
Combined with high energy (~11 meV) and temporal (~280 fs) resolution.

Main Results:

Demonstrated system performance by analyzing spectral broadening of Bi2Se3 topological surface states.
Correlated spectral broadening with probe pulse spatial dimensions and resolved inhomogeneity contributions.
Successfully performed time-resolved micro-ARPES on a ~30 μm WTe2 flake after in situ exfoliation.

Conclusions:

The developed time-resolved micro-ARPES system is effective for investigating ultrafast electron dynamics.
The system provides momentum-resolved insights into micro-exfoliated materials.
Enables detailed studies of electron behavior in complex and nanoscale materials.