a) Junction between different bulk materials that share a common band-gap. In a topological system, the number of incoming edge channels and the number of outgoing edge channels is exactly the same. b) A system with an ill-defined topology is not bound by that constraint. The ill-defined topology can be used to abruptly halt wave propagation at a topological singularity. (IMAGE)

SPIE--International Society for Optics and Photonics

a) Junction between different bulk materials that share a common band-gap. In a topological system, the number of incoming edge channels and the number of outgoing edge channels is exactly the same. b) A system with an ill-defined topology is not bound by that constraint. The ill-defined topology can be used to abruptly halt wave propagation at a topological singularity.

Caption

a) Junction between different bulk materials that share a common band-gap. In a topological system, the number of incoming edge channels and the number of outgoing edge channels is exactly the same. b) A system with an ill-defined topology is not bound by that constraint. The ill-defined topology can be used to abruptly halt wave propagation at a topological singularity.

Credit

D. Fernandes and M. Silveirinha, TECNICO LISBOA.

Usage Restrictions

NONE

License

Original content

Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.