New topological metamaterial amplifies sound waves exponentially

Topological metamaterial

A ‘bosonic Kitaev chain’ gets its special properties from its nature as a topological material. This metamaterial, which uniquely amplifies sound waves, was realised by having nanomechanical resonators interact with laser light via radiation pressure forces. The so-called ‘bosonic Kitaev chain’ is based on nanomechanical resonators coupled with laser light via radiation pressure. The material amplifies mechanical vibrations exponentially in one direction, while transmission in the other direction is blocked.

Application of research findings

The results, published in Nature, mark a new phase in research into topological materials and their applications. For example, they could significantly improve the sensitivity of nanomechanical sensors. In fact, topological amplification is insensitive to many anomalies, but extra sensitive to specific perturbations. This could be valuable in all kinds of technology where sensitive sensors can make a difference, from biomedical analysis and industrial process control to quantum technology.