Topological valley vortex manipulation of microparticles in phononic crystals

Topological valley states, emerging as an exciting field in condensed matter physics, are attracting attention because of their potential as a new type of information carrier with orbital angular momentum. In this paper, we exhibit that the acoustic valley states can achieve trapping of microparticles due to the acoustic radiation force induced by the acoustic vortex. In addition, we can achieve the separation of microparticles based on different acoustic contrast factors. Our study shows a demonstration of acoustic valley states in the field of particle contactless manipulation. Potential applications can be predicted by the exotic interaction of acoustic vortices with microparticles, such as cell separation, drug delivery, and other biomedical applications.