2025/02/02 by Sang Hyun Park, E. J. Mele, E. J. Melé +4 · 1 voice
Engineering · Physics and Astronomy · Materials Science · #Plasmonic and Surface Plasmon Research #Topological Materials and Phenomena #Metamaterials and Metasurfaces Applications
paper · pdf · doi:10.1103/v5ph-3k44
We analyze a plasmonic model on a honeycomb lattice of metallic nanodisks that hosts nodal lines protected by local symmetries. Using both continuum and tight-binding models, we show that a combination of a synthetic time-reversal symmetry, inversion symmetry, and particle-hole symmetry enforce the existence of nodal lines enclosing the K and K' points. The nodal lines are not directly gapped even when these symmetries are weakly broken. The existence of the nodal lines is verified using full-wave electromagnetic simulations. We also show that the degeneracies at nodal lines can be relieved by introducing a Kekulé distortion that acts to mix the nodal lines near the K,K' points. Our findings open pathways for designing novel plasmonic and photonic devices without reliance on complex symmetry engineering, presenting a convenient platform for studying nodal structures in two-dimensional systems.