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fermionic dirac cones have attracted tremendous attention in the electronic systems, such as topological insulator and graphene. as the classical analogs, photonic dirac dispersions at the center of momentum space reveal a unique feature other than fermionic systems, i.e. zero-refractive-index behavior. in principle, such all-dielectric metamaterial is easily capable of scaling into optical wavelength, but it is seldom to address and promote to functional device with large area in silicon…