A first-principles formalism that enables the topological characterization of Weyl points in three-dimensional dispersive photonic continua is introduced. The chirality of Weyl points is computed through gap Chern numbers and through direct computation of the Berry curvature, in both cases solely using the photonic Green’s function.

Reference:

First principles study of topological invariants of Weyl points in continuous media (PDF)
Guilherme R. Fonseca, Filipa R. Prudencio, Mario G. Silveirinha, and  Paloma A. Huidobro
Phys. Rev. Research 6, 013017 (2024) Highlighted as Editor’s suggestion.
arxiv.org:2303.16354