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O: Fachverband Oberflächenphysik
O 40: Ultrafast electron dynamics at surface and interfaces – Poster (joint session O/TT)
O 40.18: Poster
Dienstag, 10. März 2026, 14:00–16:00, P2
Investigation of the light-dressed bandstructure of graphene — •Lina Segerer1, Marco Merboldt1, Mattis Langendorf1, Paul Werner1, Jan Philipp Bange1, Junde Liu1, Wiebke Bennecke1, Marcel Reutzel2, and Stefan Mathias1 — 1Georg-August-Universität Göttingen, I. Physikalisches Institut, Germany — 2Philipps-Universität Marburg, Germany
Time-periodic driving of solids with strong laser fields enables optical control of material properties. Photon-driven systems not only exhibit replicas of their equilibrium band structure, known as Floquet-Bloch states, but can undergo non-trivial topological phase transitions when excited with circularly polarized light. Recent advances in angle-resolved photoemission spectroscopy (ARPES) have shown that Floquet-Bloch states can be generated in graphene using linear polarized laser pulses [1,2]. However, the oblique incidence angle of the pump pulse so far has limited the realization of a purely circularly polarized light field. In this study, we overcome this challenge by integrating an extra beam path in our ultrafast momentum microscopy (MM) setup enabling backside normal-incidence excitation with linearly and strictly circularly polarized IR pump pulses. We observe light-induced Floquet-Bloch states and investigate the polarization dependence of Floquet-Volkov interference as well as modifications in the light-dressed band structure of epitaxial graphene.
[1] M. Merboldt et al., Nat. Phys. 21, 1093 (2025).
[2] D. Choi et al., Nat. Phys. 21, 1100 (2025).
Keywords: Ultrafast momentum microscopy; trARPES; light-matter interaction; Floquet-Bloch states; Graphene