Figure 2 | In-plane nodal chain and nodal link in bi-anisotropic metamaterials. (IMAGE)
Caption
a. Band structure of the bi-anisotropic effective medium model in the space of [k-45°, kz, ω]. The blue lines are band degeneracies. b. Band structure with kz = 0, nodal ring is shown in red. c. Nodal link in momentum space, in-plane nodal chain is shown in blue and the red circle is a nodal ring. Green circles indicate the π1 homotopy loops in the C2T - invariant plane. d. The projected polarization states of 2nd band at the C2T - invariant plane. e. The breaking of chain point with an in-plane plasmonic resonance, where a new nodal ring (blue) emerges on the kz = 0 plane as a consequence of the -1 non-Abelian charge accumulated along the green loop. f. The breaking of chain point with z direction plasmon resonance. No new nodal structure shows up since the green loop still encircles two nodal lines and the -1 charge remains conserved.
Credit
by Dongyang Wang, Biao Yang, Qinghua Guo, Ruo-Yang Zhang, Lingbo Xia, Xiaoqiang Su, Wen-Jie Chen, Jiaguang Han, Shuang Zhang, C. T. Chan
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