Tunable topological phononic crystals

By Ze-Guo Chen, Ying Wu. 2015

181 citations recorded by the source corpus.

Topological insulators, first observed in electronic systems, have inspired many analogues in photonic and phononic crystals in which remarkable one-way propagation edge states are supported by topologically nontrivial bandgaps. Such bandgaps can be achieved by breaking the time-reversal symmetry to lift the degeneracy associated with Dirac cones at the corners of the Brillouin zone. Here, we report on our construction of a phononic crystal exhibiting a Dirac-like cone in the Brillouin zone center. We demonstrate that simultaneously breaking the time-reversal symmetry and altering the geometric size of the unit cell result in a topological transition that is verified by the Chern number calculation and edge mode analysis. The topology of the bandgap is tunable by varying both the velocity field and the geometric size; such tunability may dramatically enrich the design and use of acoustic topological insulators.

Subfields: Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/e0970a610125cd165fee6eb2dd21f26c89f2afc4

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In Atomic and Molecular Physics, and Optics

1. Baile Zhang
2. Guoliang Huang
3. H. Nassar
4. Haoran Xue
5. Yihao Yang

In Electronic, Optical and Magnetic Materials

1. Guoliang Huang
2. H. Nassar

Citations in the corpus

• A study of topological effects in 1D and 2D mechanical lattices (2018, background): “…flexural waves ( Liu and Semperlotti, 2017; Pal and Ruzzene, 2017; Vila et al., 2017 ) whereas other insulators, such as the quantum Hall ( Chen and Wu, 2016; Fleury et al., 2016; Nash et al., 2015; Yang et al., 2015 ) and the quantum spin Hall insulators ( Mousavi et al., 2015; Süsstrunk…”
• Topological acoustics (2022, background): “Acoustic QH phases can also be implemented in other lattice geometries with flows, such as honeycomb [24, 25] and square lattices [28].”