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

S K Y Dufresne; S Zhdanovich; M Michiardi; B G Guislain; M Zonno; V Mazzotti; L O'Brien; S Kung; G Levy; A K Mills; F Boschini; D J Jones; A Damascelli

doi:10.1063/5.0176170

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

Rev Sci Instrum. 2024 Mar 1;95(3):033907. doi: 10.1063/5.0176170.

Authors

S K Y Dufresne^{1

2}, S Zhdanovich^{1

2}, M Michiardi^{1

2}, B G Guislain^{1

2}, M Zonno^{1

2}, V Mazzotti¹, L O'Brien¹, S Kung^{1

2}, G Levy^{1

2}, A K Mills^{1

2}, F Boschini^{1

3}, D J Jones^{1

2}, A Damascelli^{1

2}

Affiliations

¹ Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada.
² Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
³ Centre Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, Varennes, Québec J3X 1S2, Canada.

PMID: 38517258
DOI: 10.1063/5.0176170

Abstract

We present the development of a versatile apparatus for 6.2 eV laser-based time and angle-resolved photoemission spectroscopy with micrometer spatial resolution (time-resolved μ-ARPES). With a combination of tunable spatial resolution down to ∼11 μm, high energy resolution (∼11 meV), near-transform-limited temporal resolution (∼280 fs), and tunable 1.55 eV pump fluence up to 3 mJ/cm2, this time-resolved μ-ARPES system enables the measurement of ultrafast electron dynamics in exfoliated and inhomogeneous materials. We demonstrate the performance of our system by correlating the spectral broadening of the topological surface state of Bi2Se3 with the spatial dimension of the probe pulse, as well as resolving the spatial inhomogeneity contribution to the observed spectral broadening. Finally, after in situ exfoliation, we performed time-resolved μ-ARPES on a ∼30 μm flake of transition metal dichalcogenide WTe2, thus demonstrating the ability to access ultrafast electron dynamics with momentum resolution on micro-exfoliated materials.