Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 57: Ultrafast Electron Dynamics I
O 57.4: Talk
Wednesday, March 19, 2025, 11:30–11:45, H2
Observation of Floquet states in graphene — •Marco Merboldt1, Michael Schüler2, David Schmitt1, Jan Philipp Bange1, Wiebke Bennecke1, Karun Gadge3, Salvatore R. Manmana3, Sabine Steil1, G. S. Matthijs Jansen1, Daniel Steil1, Michael Sentef4, Marcel Reutzel1, and Stefan Mathias1 — 1Georg-August-Universität Göttingen, I. Physikalisches Institut, Germany — 2Department of Physics, University of Fribourg, Fribourg, Switzerland — 3Georg-August-Universität Göttingen, Institut für Theoretische Physik, Germany — 4Institute for Theoretical Physics, University of Bremen, Bremen, Germany
Recent advances in the field of condensed-matter physics have unlocked the potential to realize and control emergent material phases that do not exist in thermal equilibrium. One of the most promising concepts in this regard is Floquet engineering, the coherent dressing of matter via time-periodic perturbations. However, the broad applicability of Floquet engineering to quantum materials is in question, especially with respect to (semi-)metals and graphene in particular.
Here, we resolve this long-standing debate by using electronic structure measurements to provide direct spectroscopic evidence of Floquet effects in graphene [1]. We report light-matter-dressed Dirac bands by measuring the contribution of Floquet sidebands, Volkov sidebands, and their quantum path interference to graphene’s photoemission spectrum. Fully supported by experiment and theory, we demonstrate that Floquet engineering in graphene is possible.
[1] Merboldt et al., arXiv:2404.12791 (2024)
Keywords: Ultrafast momentum microscopy; trARPES; Graphene; light-matter interaction; Floquet engineering