We propose a scheme that the material dispersion can be immune in a kind of photonic topological metacrystal with uniform permittivity and permeability but staggered bianisotropy. The topological behaviors can be maintained even though the metamaterials are intrinsically dispersive. A nontrivial topological band gap with a large gap spin Chern number is confirmed in such dispersion-immune photonic topological metacrystals. Two proposals of a robust pseudospin-polarized power splitter and a slow-light waveguide show evidence on the manipulation of the pseudospin-momentum locked states in a backscattering-free manner. In addition, a realistic design of a nontrivial dispersion-immune photonic metacrystal is also issued and discussed.
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Chen et al. (2015) studied this question.
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