Single-mode interface states in heterostructure waveguides with Bragg and non-Bragg gaps.

ABSTRACT: Interface states can always arise in heterostructures that consist of two or more (artificial) materials with topologically different energy bands. The gapped band structure can be classified by the Chern number (a topological invariant) generally or the Zak phase in one-dimensional periodic systems. Recently, topological properties have been employed to investigate the interface states occurring at the connecting regions of the heterostructures of mechanical isostatic lattices and acoustical waveguides. Here, we study this heterostructure phenomenon by carefully connecting two corrugated stainless steel waveguides with Bragg and non-Bragg gaps at approximately the same frequency. These two waveguide structures can be achieved by continuously varying their geometry parameters when a topolo

SUBMITTER: Fan YX 

PROVIDER: S-EPMC5347004 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature