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O: Fachverband Oberflächenphysik

O 68: Focus Session: Time-Resolved Momentum Microscopy

Donnerstag, 8. September 2022, 15:00–18:30, H3

Time-resolved momentum microscopy is a new experimental technique to study electron dynamics in momentum space. In momentum microscopy, the reciprocal image plane of photoemitted electrons is mapped onto a position-sensitive detector. In addition, the kinetic energy is extracted by energy dispersive elements, such as Time-of-Flight drift tubes or hemispherical analysers. Hereby, the complete information about the electronic structure of two-dimensional materials can be obtained (kx, ky, E). At the same time the signal can be restricted to micrometer-size spots, which is important for many types of quantum materials. By combining such electron spectrometers with pump-probe laser techniques, optical excitations, photo-induced phase transitions and charge transfer processes within the entire Brillouin zone can be imaged on ultrashort time scales. Several groups, with many of them in Germany, have established this technique during the last years in lab-based setups. In addition, first setups at large scale facilities, like ELI-ALPS or FLASH, are being commissioned or in operation. With higher photon energies available at free electron lasers, also structural dynamics will be observable through time-resolved electron diffraction.

Organizer: Robert Wallauer (Universität Marburg)

	15:00	O 68.1	Topical Talk: Exploring Excitonic Excitations in Momentum Space — •Keshav Dani
	15:30	O 68.2	Topical Talk: Moiré interlayer and charge-transfer excitons in space and time: new experiments enabled by time-resolved momentum microscopy — •Stefan Mathias
	16:00	O 68.3	The complete interface molecular movie: One-stop imaging of orbital, electronic, and structural dynamics — •Markus Scholz, Kiana Baumgärtner, Marvin Reuner, Christian Metzger, Michael Heber, Dmytro Kutnyakhov, Friedrich Reinert, Daria Popova-Gorelova, Martin Beye, and Kai Rossnagel
	16:15	O 68.4	Electron dynamics after a spin- and valley-polarized electronic excitation in WS2 — •Lasse Münster, Sarah Zajusch, Raul Perea-Causin, Samuel Brem, Katsumi Tanimura, Jens Güdde, Yaroslav Gerasimenko, Rupert Huber, Ermin Malic, Ulrich Höfer, and Robert Wallauer
	16:30	O 68.5	Topical Talk: Momentum and energy dissipation of hot electrons in metals and metal-molecular heterostructures — •Benjamin Stadtmueller
	17:00	O 68.6	Coherent response of the electronic system driven by non-interfering laser pulses — •Tobias Eul, Eva Prinz, Michael Hartelt, Benjamin Frisch, Martin Aeschlimann, and Benjamin Stadtmüller
	17:15	O 68.7	Time-resolved photoemission orbital tomography of CuPc on Cu(001)-2O — •Alexa Adamkiewicz, Miriam Raths, Monja Stettner, Francois C. Bocquet, Christian Kumpf, Robert Wallauer, F. Stefan Tautz, and Ulrich Höfer
	17:30	O 68.8	Topical Talk: Is there a perfect electron analyzer for time-resolved ARPES? — •Laurenz Rettig
	18:00	O 68.9	Developing a fs-XUV source for time-resolved momentum microscopy on 2D materials — •Karl Schiller, Alan Omar, Lasse Sternemann, Matija Stupar, Clara Saraceno, and Mirko Cinchetti
	18:15	O 68.10	FEL-based time-of-flight momentum microscopy: 3 time-resolved photoemission modalities in 1 experiment — •D. Kutnyakhov, R.P. Xian, M. Dendzik, M. Heber, F. Pressacco, S.Y. Agustsson, L. Wenthaus, H. Meyer, S. Gieschen, K. Bühlman, S. Däster, R. Gort, D. Curcio, K. Volckaert, M. Bianchi, Ch. Sanders, J.A. Miwa, S. Ulstrup, A. Oelsner, C. Tusche, Y.-J. Chen, D. Vasilyev, K. Medjanik, G. Brenner, S. Dziarzhytski, S. Dong, J. Hauer, L. Rettig, J. Demsar, H.-J. Elmers, Ph. Hofmann, R. Ernstorfer, G. Schönhense, Y. Acremann, and K. Rossnagel