Valley Vortex States in Sonic Crystals
arXiv:1707.02059 · doi:10.1103/PhysRevLett.116.093901
Abstract
Valleytronics is quickly emerging as an exciting field in fundamental and applied research. In this Letter, we study the acoustic version of valley states in sonic crystals and reveal a vortex nature of such states. Besides the selection rules established for exciting valley polarized states, a mimicked spin Hall effect of sound is proposed further. The extraordinary chirality of valley vortex states, detectable in experiments, may open new possibility in sound manipulations. This is appealing to scalar acoustics that lacks spin degree of freedom inherently. Besides, the valley selection enables a handy way to create vortex matter in acoustics, in which the vortex chirality can be controlled flexibly. Potential applications can be anticipated with the exotic interaction of acoustic vortices with matter, such as to trigger the rotation of the trapped microparticles without contact.
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Cited by in corpus (9)
- Observation of topological valley transport of sound in sonic crystals
- Edge waves in plates with resonators: An elastic analogue of the quantum valley Hall effect
- Observation of topological valley modes in an elastic hexagonal lattice
- Tunable Acoustic Valley-Hall Edge States in Reconfigurable Phononic Elastic Waveguides
- Zone folding induced topological insulators in phononic crystals
- Acoustic Dirac degeneracy and topological phase transitions realized by rotating scatterers
- Dial-in Topological Metamaterials Based on Bistable Stewart Platform
- Transverse angular momentum in topological photonic crystals
- Experimental observation of sound-mediated stable configurations for polystyrene particles