Dresden 2026 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
O: Fachverband Oberflächenphysik
O 66: Ultrafast electron dynamics at surface and interfaces III
O 66.3: Talk
Wednesday, March 11, 2026, 15:45–16:00, TRE/MATH
Probing topological Floquet states in graphene with ultrafast STM — •Nils Jacobsen1,2, Melanie Müller3, Michael Schüler4,5, Martin Wolf3, and Angel Rubio2,6 — 1University of Bremen — 2MPSD Hamburg — 3FHI Berlin — 4PSI Villingen Switzerland — 5University of Fribourg Switzerland — 6CCQ The Flatiron Institute New York USA
The light-induced anomalous Hall effect in graphene driven by circularly polarized light is a hallmark example of Floquet band engineering [1]. It has been observed in ultrafast transport experiments [2] and Floquet Bloch bands in graphene have recently been resolved by time- and angle-resolved photoemission spectroscopy [3]. Here, we propose ultrafast scanning tunnelling microscopy (USTM) as a complementary probe of topological Floquet states in graphene [4]. In our simulations, dynamical band gaps and topological edge states are directly reflected in the local density of states and the ultrafast tunnelling currents. The chirality of the edge states is revealed by the suppression of backscattering at impurities, which could be probed by ultrafast STM. These results establish ultrafast STM as a promising tool to access light-induced topological states in quantum materials. [1] Oka PRB 79, 081406(R) (2009) [2] McIver Nat. Phys. 16, 38-41 (2020) [3] Merboldt, Schüler et al. Nat. Phys. 21 1093-1099 (2025), Choi, Mogi et al. Nat. Phys. 21 1100-1105 (2025) [4] Müller Prog. Surf Sci. 99, 100727 (2024)
Keywords: THz STM; Floquet engineering; light induced QAHE