Regensburg 2025 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 23: Poster Ultrafast Electron Dynamics

O 23.14: Poster

Montag, 17. März 2025, 18:00–20:00, P2

Femtosecond momentum microscopy of field-effect gated bilayer WSe₂ and monolayer graphene — •Bent van Wingerden, Jan Philipp Bange, Jonas Pöhls, Wiebke Bennecke, Paul Werner, Daniel Steil, Matthijs Jansen, R. Thomas Weitz, Marcel Reutzel, and Stefan Mathias — I. Physikalisches Institut, Georg-August Universität Göttingen, Germany

Atomically-thin transition metal dichalcogenides and their respective Moiré heterostructures can host a variety of strongly correlated electronic phases, such as Wigner crystals and Mott insulators. The formation of these phases critically depends on the precise occupation of the corresponding Moiré superlattice states [Regan et al. Nature 579, (2020)], and might therefore be controlled by field-effect doping of charge carriers [Nguyen et al. Nature 572 (2019)]. In our work, we realized this in combination with a table-top time-resolved ARPES setup, i.e. our Göttingen femtosecond momentum microscopy experiment [Schmitt et al., Nature 608, (2022)]. Our extension of ARPES experiments on field-effect gated heterostructures into the time domain on a laboratory scale will facilitate the study of non-equilibrium dynamics of strongly correlated phases and charged quasiparticles, e.g. trions. We provide proof-of-principle data on field-effect gated monolayer graphene and present time-resolved photoemission data of a WSe₂ bilayer at different charge carrier densities.

Keywords: Field-Effect Gating; 2d Materials; Momentum Microscopy; Ultrafast Dynamics