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O: Fachverband Oberflächenphysik

O 58: Poster Session - Ultrafast Electron Dynamics at Surface and Interfaces

O 58.2: Poster

Dienstag, 17. März 2020, 18:15–20:00, P2/2OG

Time resolved ARPES using femtosecond extreme ultraviolet laser pulses at 1 MHz repetition rate — •Jan Philipp Bange, Germaine Arend, Marten Düvel, Christina Möller, Marco Merboldt, Marcel Reutzel, Matthijs Jansen, Sabine Steil, Daniel Steil, and Stefan Mathias — I. Physikalisches Institut, Georg-August-Universität Göttingen, Germany

Angle-resolved photoemission spectroscopy (ARPES) is a powerful tool to map the momentum and energy dependent electron distribution of solids. Moreover, a time resolved ARPES setup is predestinated to investigate the ultrafast behaviour of electrons and the versatile couplings between electron and structural degrees of freedom. We apply femtosecond high harmonic generated (HHG) extreme ultraviolet (EUV) pulses at 21.6 eV as a probe. By generating the EUV pulses in a tight focusing geometry in an argon gas jet and by using a combination of reflective and transmissive optics we achieve both a small spectral bandwidth and a high photon flux of the probe beam. This enables us to capture distinct features in the photoemission spectra while keeping the integration time short due to a repetition rate of 1 MHz. The fundamental of the laser at 1.2 eV acts as pump resulting in a pump-probe setup. With this stroboscopic technique we investigate and capture the ultrafast electron dynamics in various material systems such as metal-organic hybrid interfaces, complex transition metal oxides and dichalogenides.