Near-zero index magneto-optical medium realized with an unpaired Dirac point
arXiv:1712.09502 · doi:10.1103/PhysRevB.98.205115
Abstract
We realize an unpaired Dirac cone at the center of the first Brillouin zone, using a gyromagnetic photonic crystal with broken square sub-lattice symmetry and broken time reversal symmetry. The behavior of the Dirac modes can be described by a gyromagnetic effective medium model with near-zero refractive index, and Voigt parameter near unity. When two domains are subjected to opposite magnetic biases, there exist unidirectional edge states along the domain wall. This establishes a link between topological edge states and the surface waves of homogenous magneto-optical media.
8 pages, 4 figures
References in corpus (6)
- Topological Photonics
- Reflection-Free One-Way Edge Modes in a Gyromagnetic Photonic Crystal
- Analogs of quantum Hall effect edge states in photonic crystals
- Experimental observation of optical Weyl points
- Bulk-edge correspondence for topological photonic continua
- Photonic Chern insulator through homogenization of an array of particles