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. 2015 Sep 23;6:8183. doi: 10.1038/ncomms9183

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(a) Dispersion of the structure shown in Fig. 3g. Blue/red solid line denotes pseudospin-up/spin-down edge mode, which is even under reflection about z=−a/4. Green dashed lines denote E_z-polarized bulk plane wave modes propagating in the xy plane, which is odd under mirror reflection. The grey area represents the projected bulk modes (even) in a single PEC parallel plate waveguide. (b) Eigen electric field of the spin-up mode at k_x=0.5(π/a). (c) Eigen electric field of the lowest plane wave band at k_x=0.5(π/a).