AB-layer-stacked photonic crystal made of a generic biaxial dielectric (IMAGE)
Caption
a, Structure of the PhC, where the two insets display the iso-frequency surfaces in the xz plane of the biaxial dielectrics in layer A (orange) and layer B (green). b, Band structure along high symmetry lines in the k_y=0 plane. The blue and magenta lines represent the bands with odd and even mirror-parities, respectively. The red dots correspond to the nodal lines along which two bands with opposite mirror-parities intersect. The orange and purple dots denote the threefold and fourfold degenerate nexus points, respectively. c, Sketch map of two red nodal rings (corresponding to the two lowest red dots in b) crossing a Kramers-like nodal line (blue line) at two nexus points in the first (bulk) Brillouin zone of the PhC
Credit
by Zhongfei Xiong, Ruo-Yang Zhang2, Rui Yu, C. T. Chan, Yuntian Chen
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