Multiple Weyl points and the sign change of their topological charges in woodpile photonic crystals
Multiple Weyl points and the sign change of their topological charges in woodpile photonic crystals
We show that Weyl points with topological charges 1 and 2 can be found in very simple chiral woodpile photonic crystals, which can be fabricated using current techniques down to the nano-scale. The sign of the topological charges can be tuned by changing the material parameters of the crystal, keeping …