Journal
ADVANCED SCIENCE
Volume 9, Issue 24, Pages -Publisher
WILEY
DOI: 10.1002/advs.202201568
Keywords
acoustic high-order topological insulator; Dirac mass; hinge state; surface state; zero refractive index
Categories
Funding
- National Natural Science Foundation of China [12102315]
- National Natural Science Foundations of China [12074281]
- Jiangsu Distinguished Professor Funding
- Australia Research Council [DP190103186, DP210103523, FT210100806]
- Australian Research Council [FT210100806] Funding Source: Australian Research Council
Ask authors/readers for more resources
This study demonstrates the discovery of 2D surface states described by spin-1 Dirac equations at the interfaces between two sonic crystals with distinct topology but the same crystalline symmetry. The Dirac mass of these surface states can be tuned by the geometry of the crystals. The study also confirms the existence of zero refractive index behavior and emergent topological hinge states.
Using 3D sonic crystals as acoustic higher-order topological insulators (HOTIs), 2D surface states described by spin-1 Dirac equations at the interfaces between the two sonic crystals with distinct topology but the same crystalline symmetry are discovered. It is found that the Dirac mass can be tuned by the geometry of the two sonic crystals. The sign reversal of the Dirac mass reveals a surface topological transition where the surface states exhibit zero refractive index behavior. When the surface states are gapped, 1D hinge states emerge due to the topology of the gapped surface states. The zero refractive index behavior and the emergent topological hinge states are confirmed experimentally. This study reveals a multidimensional Wannier orbital control that leads to extraordinary properties of surface states and unveils an interesting topological mechanism for the control of surface waves.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available