Investigation of non-reciprocity and behavior of defect modes in photonic crystals incorporating Weyl semimetals

The ability to control the frequency of defect modes in photonic crystals has led to the emergence ofnovel applications. Researchers have recognized the unique properties of Weyl semimetals andexplored their utilization in photonic crystals. This study investigates the non-reciprocal properties inphotonic crystals incorporating Weyl semimetals and examines the behavior of defect modes withinthese crystals. This paper employs a photonic crystal containing Weyl semimetals with two differentstructures. Initially, the non-reciprocal properties in both structures are examined, followed by ananalysis of the behavior of defect modes. The results indicate that only utilizing Weyl semimetal in thephotonic crystal does not result in non-reciprocity. The arrangement of layers next to each other, orthe geometry, plays a crucial role in non-reciprocity. Additionally, the behavior of defect modes variesdepending on the structure type and propagation direction.