Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 85: Ultrafast Electron Dynamics at Surfaces and Interfaces II: New Methods and Developments

O 85.5: Vortrag

Donnerstag, 4. April 2019, 16:00–16:15, H16

Experimental setup for time-resolved momentum microscopy — •Jasmin Fehl¹, Katerina Medjanik², David Janas¹, Felix Paßlack¹, Stefano Ponzoni¹, Mahdi Hajlaoui¹, Giovanni Zamborlini¹, Gerd Schönhense², and Mirko Cinchetti¹ — ¹Experimentelle Physik VI, TU Dortmund, Otto-Hahn-Straße 4, 44227 Dortmund, Germany — ²Institut für Physik, Johannes Gutenberg-Universität, Staudinger Weg 7, 55128 Mainz, Germany

ARPES is the most common method to map electronic bands. Recently, momentum microscopy (MM), has been introduced as a novel highly efficient way to perform ARPES in large momentum space regions [1]. In this talk, we will discuss the realization and characterization of an experimental apparatus for laser-assisted MM. The setup is based on a sub-100 fs laser system for pump-probe experiments with pump and probe beams tunable in the whole visible spectrum (photon energy range: 1.0 eV - 6.0 eV) and repetition rate tunable from single shot up to 1 MHz. The laser is coupled to a momentum microscope equipped with a time of flight analyser. This system will allow us to probe the ultrafast dynamics in low-dimensional electron systems, with particular emphasis on hybrid interfaces - so called molecular spinterfaces [2] - and on materials with non-trivial spin-texture, such as topological insulators.

[1] Medjanik, K. et al. Nature Materials 16, 61 (2017)

[2] M. Cinchetti, V. A. Dediu, and L.E. Hueso, Nature Materials 16, 507 (2017).