Observation of topological edge states induced solely by non-Hermiticity in an acoustic crystal
He Gao, Haoran Xue, Qiang Wang, Zhongming Gu, Tuo Liu, Jie Zhu, Baile Zhang
Abstract
Most existing non-Hermitian topological systems derive their nontrivial topology from Hermitian factors. Here, the authors report on the experimental observation of acoustic topological edge states induced solely by non-Hermiticity. They show that non-Hermiticity is able to create a topological band gap from a gapless Hermitian system. The study offers the possibilities for actively steerable topological wave manipulations in applications ranging from acoustics to photonics.
Topics & Concepts
Gapless playbackHermitian matrixTopology (electrical circuits)PhysicsEnhanced Data Rates for GSM EvolutionPhotonic crystalQuantum mechanicsMathematicsCondensed matter physicsComputer scienceTelecommunicationsCombinatoricsQuantum Mechanics and Non-Hermitian PhysicsTopological Materials and PhenomenaQuantum, superfluid, helium dynamics