Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 36: Poster: Ultrafast Electron Dynamics at Surfaces and Interfaces

O 36.17: Poster

Tuesday, March 19, 2024, 18:00–20:00, Poster C

An XUV time- and angle-resolved photoemission spectroscopy setup for complementary experiments with high temporal and high energy resolution — •Mohamed Amine Wahada, Tommaso Pincelli, Lawson Lloyd, Alessandro de Vita, Tulio de Castro, Martin Wolf, Ralph Ernstorfer, and Laurenz Rettig — Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany

Time and angle resolved photoemission spectroscopy (trARPES) is a powerful technique to investigate the transient electronic band structure of materials on a femtosecond timescale. However, due to the Heisenberg's uncertainty principle, the achievable energy resolution is limited by the pulse bandwidth required for a given temporal resolution. Here, we present a new scheme to benefit separately from a high temporal resolution or a high energy resolution within one single experiment operating in the extreme ultraviolet (XUV) regime at 500 kHz. In the first case, 40 fs, 400 nm laser pulses generated by optical parametric chirped pulse amplification are used to generate the XUV. In the second case, 200 fs laser pulses at 515 nm are used. Both beams are guided to a harmonics generation chamber, where a single harmonic at ~21.7 eV is isolated and guided into the experimental trARPES chamber. The first setup allows high ~20 fs temporal resolution measurements while the second setup achieves an energy resolution of <40 meV. In conjunction with a wavelength tunable pump, this tool allows to perform pump probe ARPES experiment on the same sample granting access to complementary observables.

Keywords: extreme ultraviolet; trARPES; electron dynamics