Chiral edge-state signatures of Berry monopole merging and splitting in a bilayer photonic crystal slab with synthetic momentum

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Abstract
Berry monopoles are point degeneracies in parameter space where the Berry curvature emanates radially, analogous to magnetic monopoles. Here, we report the adiabatic merging and splitting of Berry monopoles in a bilayer photonic crystal slab combining one genuine and one synthetic momentum. Two monopoles approach, merge, and split within this hybrid parameter space. The process is described by an effective coupled-mode model and confirmed by full-wave simulations. We further propose a scheme to experimentally probe the Berry monopole merging and splitting by monitoring the evolution of chiral edge states localized at the interface between two topological phases with inverted band structures.
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Funding Information
  • Eusko Jaurlaritza
  • Ikerbasque, Basque Foundation for Science
  • Diputación Foral de Gipuzkoa (QUAN-000021-01)
  • European Regional Development Fund
  • Ministerio de Ciencia, Innovación y Universidades (PRE2021-097126)
  • Agence Nationale de la Recherche (ANR-24-CE24-7616-01)
  • Institute for Basic Science

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