Fig. 7: Effect of the X1 modulation and Weyl points coupling.
From: Cubic 3D Chern photonic insulators with orientable large Chern vectors
From the analytical model, a four-fold degeneracy point is achieved at the folding condition \({B}_{z}=\frac{\delta }{\alpha -\beta }\), as shown in panel a. When a X1 modulation is introduced, the Weyl dipole couples and a band-gap is opened, as showed in panel b. Parameters: a = −7, b = −30, α = 1, c = 1, d = 30, γ = 1, β = 0.45, δ = 7.5, C1,2,3 = 1, p1 = 7, q1 = 0.
