Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 10: Focus Session Ultrafast Electron Microscopy at the Space-Time Limit II
O 10.6: Talk
Monday, March 17, 2025, 16:45–17:00, H2
Subcycle band-structure videography of quantum materials — •Vincent Eggers1, Manuel Meierhofer1, Jakob Helml1, Lasse Münster1, Robert Wallauer2, Giacomo Inzani1, Sarah Zajusch2, Suguru Ito2, Leon Machtl1, Yin Hao3, François C. Posseik3, Changhua Bao1, Jens Güdde2, F. Stefan Tautz3, Rupert Huber1, and Ulrich Höfer1,2 — 1Department of Physics and Regensburg Center for Ultrafast Nanoscopy, University of Regensburg, 93040 Regensburg, Germany — 2Department of Physics, Philipps-Universität Marburg, 35037 Marburg, Germany — 3Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
We introduce the next generation of subcycle band-structure videography. By combining atomically strong few-cycle mid-infrared lightfields with sub-10-femtosecond XUV pulses in a momentum microscope, lightwave-driven dynamics can now be investigated throughout the entire Brillouin zone. Here, we observe electrons driven by carrier fields of light reaching amplitudes as high as MV/cm in graphene. Subcylce analysis of the timing of these lightwave-driven currents reveals femtosecond scattering times. Our novel setup provides a new platform to explore strong-field phenomena ranging from inter- and intraband dynamics to Bloch oscillations and the emergence of Floquet-Bloch states directly in subcycle videos covering the full band structure.
Keywords: Momentum microscopy; Graphene; MIR; Lighwave-driven currents; Subcycle