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O: Fachverband Oberflächenphysik
O 92: Post-Deadline Session
O 92.2: Talk
Thursday, March 12, 2026, 19:45–20:00, HSZ/AUDI
Band-structure cinematography of Landau-Zener-Majorana transitions in graphene — •Vincent Eggers1, Giacomo Inzani1, Manuel Meierhofer1, Lasse Münster1, Jakob Helml1, Robert Wallauer2, Sarah Zajusch2, Suguru Ito2, Leon Machtl1, Hao Yin3, Christian Kumpf3, François C. Bocquet3, Changhua Bao1, Jens Güdde2, F. Stefan Tautz3, Rupert Huber1, and Ulrich Höfer1,2 — 1Department of Physics and Regensburg Center for Ultrafast Nanoscopy (RUN), University of Regensburg, 93040 Regensburg, Germany — 2Department of Physics, Philipps-Universität Marburg, 35037 Marburg, Germany — 3Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany
Non-adiabatic Landau-Zener-Majorana (LZM) tunnelling is believed to play a central role in the interaction of strong light fields with solids but has remained notoriously elusive despite its fundamental importance. Using a novel combination of momentum microscopy and subcycle ARPES, we clearly reveal the periodic interplay of field-driven interband LZM tunnelling and intraband acceleration of quasi-relativistic fermions along the Dirac cone of epitaxial monolayer graphene on SiC(0001) directly in full 2D momentum space. The extremely non-thermal electron distributions also allow us to disentangle competing scattering processes and assess their impact on coherent electronic control through electron redistribution and thermalization.
Keywords: Subcycle; Momentum microscopy; Strong-field; Graphene; Ultrafast