Acoustic Dirac degeneracy and topological phase transitions realized by rotating scatterers

Abstract

The artificial crystals for classical waves provide a good platform to explore the topological physics proposed originally in condensed matter systems. In this paper, acoustic Dirac degeneracy is realized by simply rotating the scatterers in sonic crystals, where the degeneracy is induced accidentally by modulating the scattering strength among the scatterers during the rotation process. This gives a flexible way to create topological phase transition in acoustic systems. Edge states are further observed along the interface separating two topologically distinct gapped sonic crystals.

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References in corpus (6)

• The electronic properties of graphene
• Scheme to Achieve Silicon Topological Photonics
• Observation of topological valley transport of sound in sonic crystals
• Valley Vortex States in Sonic Crystals
• Edge waves in plates with resonators: An elastic analogue of the quantum valley Hall effect
• Do Linear Dispersions of Classical Waves Mean Dirac Cones?

Cited by in corpus (2)

• Topological edge states of Kekulé-type photonic crystals induced by a synchronized rotation of unit cells
• Topological band structure of surface acoustic waves on a periodically corrugated surface