Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 43: Scanning Probe Microscopy: Light-Matter Interactions at the Atomic Scale II
O 43.3: Vortrag
Dienstag, 18. März 2025, 14:30–14:45, H24
Probing topological Floquet states in graphene with ultrafast STM — •Nils Jacobsen1,2, Melanie Müller3, Michael Schüler4,5, Martin Wolf3, Angel Rubio2,6, and Michael Sentef1,2 — 1ITP, University of Bremen, Bremen, Germany — 2Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany — 3Fritz Haber Institute, Berlin, Germany — 4Laboratory for Materials Simulations, Paul Scherrer Institut, Villigen, Switzerland — 5Department of Physics, University of Fribourg, Fribourg, Switzerland — 6Center for Computational Quantum Physics The Flatiron Institute, New York, USA
Floquet band engineering enables the control of solids via periodic laser driving. The light-induced quantum anomalous Hall effect (QAHE) in graphene with circularly polarized light [1] has been measured in ultrafast transport [2] and recently, Floquet replica bands under linearly polarized light have been reported in time-resolved photoemission spectroscopy [3]. Here, we explore the possibility of probing (topological) Floquet states in graphene with ultrafast scanning tunneling microscopy (USTM) as a complementary experimental technique [4]. Being highly sensitive to gap openings in the local density of states and the formation of edge states, USTM is a promising and versatile tool for probing light-induced topological states in quantum materials.
[1] Oka et al. PRB 79, 081406(R) (2009) [2] McIver et al. Nat. Phys. 16, 38-41 (2020) [3] Merboldt et al. arXiv:2404.12791 (2024) , Choi et al. arXiv:2404:14392 (2024) [4] Müller Prog. Surf Sci. 99, 100727 (2024)
Keywords: Ultrafast STM; Floquet engineering; Light-induced QAHE