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Symmetry-enforced three-dimensional Dirac phononic crystals
- 发表刊物：Light: Science & Applications
- 摘要：Dirac semimetals, the materials featuring fourfold degenerate Dirac points, are critical states of topologically distinct phases. Such gapless topological states have been accomplished by a band-inversion mechanism, in which the Dirac points can be annihilated pairwise by perturbations without changing the symmetry of the system. Here, we report an experimental observation of Dirac points that are enforced completely by the crystal symmetry using a nonsymmorphic three-dimensional phononic crystal. Intriguingly, our Dirac phononic crystal hosts four spiral topological surface states, in which …
- 卷号：9
- 期号：1
- 页面范围：1-6
- 是否译文：否
- 发表时间：2020-03-10
- 发布期刊链接：https://www.nature.com/articles/s41377-020-0273-4
