Gapless surface states originated from accidentally degenerate quadratic band touching in a three-dimensional tetragonal photonic crystal
arXiv:1705.11006 · doi:10.1103/PhysRevA.96.043842
Abstract
A tetragonal photonic crystal composed of high-index pillars can exhibit a frequency-isolated accidental degeneracy at a high-symmetry point in the first Brillouin zone. A photonic band gap can be formed there by introducing a geometrical anisotropy in the pillars. In this gap, gapless surface/domain-wall states emerge under a certain condition. We analyze their physical property in terms of an effective hamiltonian, and a good agreement between the effective theory and numerical calculation is obtained.
arXiv comment6 pages, 5 figures
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Cited by in corpus (8)
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- Space-group theory of photonic bands
- Hybrid method of plane-wave and cylindrical-wave expansions for distributed Bragg-reflector pillars: formalism and its application to topological photonics
- Topological edge states in all-dielectric square-lattice arrays of bianisotropic microwave resonators
- Fragile topological insulators protected by rotation symmetry without spin-orbit coupling
- Theoretical description of interface states in a tetragonal lattice of bianisotropic resonators