Intrinsic Triple Degeneracy Point Bounded by Nodal Surfaces in Chiral Photonic Crystal
Intrinsic Triple Degeneracy Point Bounded by Nodal Surfaces in Chiral Photonic Crystal
In periodic systems, band degeneracies are usually protected and classified by spatial symmetries. However, the Gamma point at zero-frequency of a photonic system is an intrinsic degeneracy due to the polarization degree of freedom of electromagnetic waves. We show here that in chiral photonic crystals, such an intrinsic degeneracy node …