期刊
PHYSICAL REVIEW LETTERS
卷 121, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.024301
关键词
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资金
- Research Grant Council (RGC) of Hong Kong [AOE/P-02/12]
- Special Fund for Agro-scientific Research in the Public Interest from Ministry of Agriculture of the Peoples' Republic of China [201303045]
- Natural Science Foundation of China (NSFC) [11474212]
- Natural Science Foundation of Shanghai (NSFS) [15JC1400303]
- Fundamental Research Funds for the Central Universities [2018CDXYWU0025, 2018CDJDWL0011]
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
Topological characteristics of energy bands, such as Dirac and Weyl nodes, have attracted substantial interest in condensed matter systems as well as in classical wave systems. Among these energy bands, the type-II Dirac point is a nodal degeneracy with tilted conical dispersion, leading to a peculiar crossing dispersion in the constant-energy plane. Such nodal points have recently been found in electronic materials. The analogous topological feature in photonic systems remains a theoretical curiosity, with experimental realization expected to be challenging. Here, we experimentally realize the type-II Dirac point using a planar metasurface architecture, where the band degeneracy point is protected by the underlying mirror symmetry of the metasurface. Gapless edge modes are found and measured at the boundary between the different domains of the symmetry-broken metasurface. Our Letter shows that metasurfaces are simple and practical platforms for realizing electromagnetic type-II Dirac points, and their planar structure is a distinct advantage that facilitates applications in two-dimensional topological photonics.
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