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Spin-1 Weyl Point and Surface Arc State in a Chiral Phononic Crystal
- Source :
- Phys. Rev. B 101, 214309 (2020)
- Publication Year :
- 2020
-
Abstract
- Spin-1 Weyl point is formed by three bands touching at a single point in the three dimensional (3D) momentum space, with two of which show cone-like dispersion while the third band is flat. Such a triply degenerate point carries higher topological charge $\pm2$2 and can be described by a three-band Hamiltonian. We first propose a tight-binding model of a 3D Lieb lattice with chiral interlayer coupling to form the Spin-1 Weyl point. Then we design a chiral phononic crystal that carries these spin-1 Weyl points and special straight-type acoustic Fermi arcs. We also computationally demonstrate the robust propagation of the topologically protected surface states that can travel around a corner or defect without reflection. Our results pave a new way to manipulate acoustic waves in 3D structures and provide a platform for exploring energy transport properties in 3D spin-1 Weyl systems.
- Subjects :
- Condensed Matter - Mesoscale and Nanoscale Physics
Physics - Applied Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 101, 214309 (2020)
- Publication Type :
- Report
- Accession number :
- edsarx.2004.02412
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.101.214309