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    Refractive index from negative to positive with frequencies at the Dirac-like cone in a photonic crystal

    In this paper, we numerically study the threefold accidental degeneracy conical dispersion (Driac-like cone) at the Brillouin zone center of the two-dimensional photonic crystals, which are composed of silicon...

    Zeyu Wang, Guangwu Pan, Weibin Qiu, **** Qiu… in Optical and Quantum Electronics (2019)