Fig. 2: 3D CI in a reduced magnetization environment. Uniaxial supercells (1, 1, N) with modulation parameter rm = r0/20 and WLs on selected planes for kz/2π = 0.3.
From: Cubic 3D Chern photonic insulators with orientable large Chern vectors

a, b 3D CI with Cz = 1 at large magnetization \({\eta }^{{N}_{W} = 2}=16\), corresponding to the maximum Weyl dipole separation and band-gap. c, d 3D CI in a reduced magnetic environment \({\eta }^{{N}_{W} = 3}=7.8\). The band-gap only suffers a moderate contraction, yet the Chern vector and the topological properties are preserved. Source data are provided as a Source Data file.