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O: Fachverband Oberflächenphysik
O 40: Ultrafast electron dynamics at surface and interfaces – Poster (joint session O/TT)
O 40.16: Poster
Dienstag, 10. März 2026, 14:00–16:00, P2
Experimental realization of an interferometric XUV-trARPES experiment with phase-stabilized IR pulses — •Antonius Naujok1, Gregor Zinke1,2, Franz Spartz1, Sebastian Hedwig1, Tobias Eul2, Martin Aeschlimann1, and Benjamin Stadtmüller2 — 1Department of Physics and Re search Center OPTIMAS, RPTU University Kaiserslautern- Landau, 67663 Kaiserslautern, Germany — 2Experimental Physics II, Institute for Physics, University of Augsburg, 86159 Augsburg
Layered 2D van der Waals materials, such as TMDCs, have been extensively studied for their optical properties and coherent responses. However, exploring coherent excitations and dephasing processes in such materials using time-resolved ARPES is challenging because the key points of the materials’ band structure cannot be accessed using phase-stabilized pulses in the visible regime, as has been done in most experiments thus far [1]. To overcome this limitation, we introduce a modified version of coherent multidimensional spectroscopy. This new method is based on time-resolved ARPES and utilizes a pair of phase-stabilized femtosecond infrared (fs-IR) pulses in combination with femtosecond XUV pulses for photoionization. We demonstrate the feasibility of our approach by focusing on the A-exciton excitation and the subsequent carrier dynamics in WSe2. Through temporal Fourier-analysis of the entire ARPES spectrum, we’re able to resolve distinct frequency components within characteristic features of the WSe2 electronic band structure. [1] M. Aeschlimann et al., Phys. Rev. B. 105, 205415 (2022)
Keywords: WSe2; photoemission; ultrafast; TMDC