Circular edge states in photonic crystals with a Dirac node
arXiv:1703.10590 · doi:10.1364/JOSAB.35.000107
Abstract
Edge states are studied for the two-dimensional Dirac equation in a circular geometry. The properties of the two-component electromagnetic field are discussed in terms of the three-component polarization field, which can form a vortex structure near the Dirac node with a vorticity changing with the sign of the Dirac mass. The Berry curvature of the polarization field is related to the Berry curvature of the Dirac spinor state. This quantity is sensitive to a change of boundary conditions. In particular, it vanishes for a geometry with a single boundary but not for a geometry with two boundaries. This effect is robust against the creation of a step-like edge inside the sample.
8 pages, 5 figures
References in corpus (7)
- Photonic Floquet Topological Insulators
- Photonic Analogue of Two-dimensional Topological Insulators and Helical One-Way Edge Transport in Bi-Anisotropic Metamaterials
- Analogs of quantum Hall effect edge states in photonic crystals
- Observing Zitterbewegung for photons near the Dirac point of a two-dimensional photonic crystal
- Disorder-induced Floquet Topological Insulators
- Valley symmetry breaking and gap tuning in graphene by spin doping
- Quantized Transport in Two-Dimensional Spin-Ordered Structures