Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 68: Focus Session: Time-Resolved Momentum Microscopy

O 68.2: Topical Talk

Thursday, September 8, 2022, 15:30–16:00, H3

Moiré interlayer and charge-transfer excitons in space and time: new experiments enabled by time-resolved momentum microscopy — •Stefan Mathias — I. Physikalisches Institut, Georg-August-Universität Göttingen, Germany

In my talk, I introduce the time-resolved momentum microscopy setup that we developed in Göttingen (Germany) [1], which includes a MHz repetition rate extreme-ultraviolet beamline, and has recently been upgraded with a spin-imaging detector. In the following, I will discuss exemplary research projects that we cover with this new instrument. In particular, I will focus on the spatio-temporal identification and dynamics of moiré interlayer excitons in twisted WSe2/MoS2 heterostructures [2], and on an orbital-resolved study [3] of charge-transfer exciton dynamics in C60 thin films [4].

[1] Keunecke et al., Rev. Sci. Instr. 91, 063905 (2020)

[2] Schmitt et al., arXiv:2112.05011(2021)

[3] Jansen et al., New Journal of Physics 22, 063012 (2020)

[4] Stadtmüller et al., Nature Communications 10, 1470 (2019)