Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 16: Poster Monday: Ultrafast Processes 1

O 16.6: Poster

Monday, September 5, 2022, 18:00–20:00, P4

A setup for interferometrically time-resolved multi-photon photoemission benchmarked on Ag(111) — •Hannah Strauch, Marco Merboldt, Jan Philipp Bange, Daniel Steil, G. S. Matthijs Jansen, Sabine Steil, Marcel Reutzel, and Stefan Mathias — I. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany

Time- and angle-resolved photoemission is the method of choice to directly study the electron dynamics of condensed matter systems with energy and momentum resolution. After the system is excited by a pump pulse, a delayed second pulse induces photoemission and thus probes the materials response. To complement the obtained insight with information on the coherence of the response, single-color phase-locked pulse pairs can be employed. Here, we present a setup for interferometric time-resolved multi-photon photoemission based on a passively stabilized Mach-Zehnder interferometer which produces phase-locked pulse pairs and provides an optical delay precision below 60 as. We show interferometric time- and angle-resolved multi-photon photoemission data from the Shockley surface state and the first image potential state of the Ag(111) surface as a benchmark for our setup. Supported by an optical Bloch equation model we explore possibilities to interpret such a data set.

A promising application of the interferometer is in combination a high harmonic generation EUV beamline. This enables double-pump-probe experiments with access to the full Brillouin zone, and allows a comprehensive investigation of optical excitations.