Observation of Dislocation-Induced Topological Modes in a Three-Dimensional Acoustic Topological Insulator
Observation of Dislocation-Induced Topological Modes in a Three-Dimensional Acoustic Topological Insulator
The interplay between real-space topological lattice defects and the reciprocal-space topology of energy bands can give rise to novel phenomena, such as one-dimensional topological modes bound to screw dislocations in three-dimensional topological insulators. We obtain direct experimental observations of dislocation-induced helical modes in an acoustic analog of a weak three-dimensional …