Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 70: Nanophotonics I
Q 70.4: Talk
Friday, March 14, 2025, 11:45–12:00, HS I PI
Skyrmion Bag Robustness in Plasmonic Bilayer and Trilayer Moiré Superlattices — •Julian Schwab1, Florian Mangold1, Bettina Frank1, Timothy J. Davis1,2, and Harald Giessen1 — 14th Physics Institute, Research Center SCoPE, and Integrated Quantum Science and Technology Center, University of Stuttgart, Germany — 2School of Physics, University of Melbourne; Parkville Victoria 3010, Australia
Twistronics is studied intensively in twisted 2D heterostructures and its extension to trilayer moiré structures has proven beneficial for the tunability of unconventional correlated states and superconductivity in twisted trilayer graphene. Just recently, the concept of twistronics has been applied to plasmonic lattices with nontrivial topology, demonstrating that bilayer moiré skyrmion lattices harbor multi-skyrmion textures called skyrmion bags. Here, we explore the properties of plasmonic trilayer moiré superlattices that are created by the interference of three twisted skyrmion lattices. More specifically, we explore the properties of periodic superlattices and their topological invariants. We also demonstrate that twisted trilayer skyrmion lattices harbor the same skyrmion bags as twisted bilayer skyrmion lattices. We quantify the robustness of these skyrmion bags by the stability of their topological numbers against certain disturbance fields that leads to experimental designs for topological textures with maximum robustness.
Keywords: Plasmonics; Twistronics; Topology; Skyrmion; Vector microscopy