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  • Title: Two-Dimensional Dirac Fermions Protected by Space-Time Inversion Symmetry in Black Phosphorus.
    Author: Kim J, Baik SS, Jung SW, Sohn Y, Ryu SH, Choi HJ, Yang BJ, Kim KS.
    Journal: Phys Rev Lett; 2017 Dec 01; 119(22):226801. PubMed ID: 29286809.
    Abstract:
    We report the realization of novel symmetry-protected Dirac fermions in a surface-doped two-dimensional (2D) semiconductor, black phosphorus. The widely tunable band gap of black phosphorus by the surface Stark effect is employed to achieve a surprisingly large band inversion up to ∼0.6  eV. High-resolution angle-resolved photoemission spectra directly reveal the pair creation of Dirac points and their movement along the axis of the glide-mirror symmetry. Unlike graphene, the Dirac point of black phosphorus is stable, as protected by space-time inversion symmetry, even in the presence of spin-orbit coupling. Our results establish black phosphorus in the inverted regime as a simple model system of 2D symmetry-protected (topological) Dirac semimetals, offering an unprecedented opportunity for the discovery of 2D Weyl semimetals.
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