Topological transitions in arrays of dipoles coupled to a cavity waveguide

Topological valley-Hall edge states have been realized in a variety of photonic structures across the electromagnetic spectrum because they can be easily engineered by breaking certain lattice symmetries. However, valley-Chern numbers that characterize topological phase are usually fixed symmetry-breaking perturbation and therefore forced to propagate direction. Here we consider kagome metasurface comprised subwavelength array dipole emitters/antennas, unveil one modify geometrical properties polaritons structuring local environment. As proof concept, show induce transitions via accidental Dirac points embedding inside cavity waveguide. Varying width modifies nature dipole-dipole interactions which enables manipulate Berry curvature invert without inverting perturbation. Consequently, demonstrate switch chirality polariton varying only width. This alternative approach engineering environment could also implications for other phases such as higher-order insulators.Received 26 October 2020Accepted 9 November 2021DOI:https://doi.org/10.1103/PhysRevResearch.4.013078Published American Physical Society under terms Creative Commons Attribution 4.0 International license. Further distribution this work must maintain attribution author(s) published article's title, journal citation, DOI.Published SocietyPhysics Subject Headings (PhySH)Research AreasAtom opticsAtoms, ions, & molecules cavitiesCavity quantum electrodynamicsLight-matter interactionMetamaterialsPolaritonsTopological effects systemsTopological transitionTopological matterCondensed Matter, Materials Applied PhysicsAtomic, Molecular Optical