Figure 1
From: Design and analysis of 2D one-way splitter waveguide based on topological photonics
(a) A honeycomb structure of ferrite rods in the air with a radius of 0.2a. Each domain has different magnetic properties. Band diagram of the honeycomb structure. (b) Time reversal symmetry is broken in the band diagram by applying the magnetic field, leading to one-way edge states inside the bandgap. C represents the Chern number of the bands after the symmetry has been broken.
