Multiband topological states in non-Hermitian photonic crystals
Jiapei Jiang, Bei Yan, Yuchen Peng, Jianlan Xie, Aoqian Shi, Jianjun Liu
Abstract
Novel phenomena found in non-Hermitian systems and robust edge states have attracted much attention. When non-Hermitian parameters (gain and loss) are above a critical value, the non-Hermitian photonic crystal (PC) bandgaps close, leading to a mixture of the topological edge state (TES) and topological corner state (TCS) with the bulk state. Meanwhile, new bandgaps also open, in which new TES and TCS can appear. Thus, with appropriate non-Hermitian parameters, TES can emerge in both the original bandgaps and the newly opened bandgaps. The results described here will further enrich understanding of the topological properties of non-Hermitian systems.
Topics & Concepts
Photonic crystalTopology (electrical circuits)PhotonicsPhysicsOpticsEnhanced Data Rates for GSM EvolutionTopological insulatorCrystal (programming language)State (computer science)Nonlinear opticsOptoelectronicsMaterials scienceOptical materialsState of matterQuantum opticsSurface statesRefractive indexQuantum Mechanics and Non-Hermitian PhysicsTopological Materials and PhenomenaNonlinear Photonic Systems