Three-dimensional photonic Dirac points stabilized by point group symmetry
作者： Lin Xu , Jian-Hua Jiang , HuanYang Chen , HaiXiao Wang
DOI: 10.1103/PHYSREVB.93.235155
关键词:
摘要: We discover a pair of stable three-dimensional (3D) Dirac points, 3D photonic analog graphene, in all-dielectric crystals using structures commensurate with nanofabrication for visible-frequency applications. The points carry nontrivial ${Z}_{2}$ topology and emerge large range material parameters hollow cylinder hexagonal crystals. From Kramers theorem group theory, we find that only the ${C}_{6}$ symmetry leads to point stabilized are characterized $\stackrel{P\vec}{k}\ifmmode\cdot\else\textperiodcentered\fi{}\stackrel{P\vec}{P}$ theory bands combination analysis. Breaking inversion splits into Weyl points. physical properties experimental consequences also studied. found be robust against parameter tuning weak disorders.
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