Extended Data Fig. 1: Permeability tensor of the gyromagnetic material.
From: Topological Chern vectors in three-dimensional photonic crystals
a,b, Frequency-dependent elements μr and κ of the permeability tensor of the gyromagnetic material for B = 0.20 T and 0.45 T, respectively. The grey dashed line in a indicates the Weyl frequency in Fig. 2, and the grey rectangle in b indicates the bandgap of the photonic crystal in Fig. 2. c, Dispersionless μr and κ adopted in all simulations as a function of biasing magnetic fields.
