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  • Title: Highly Anisotropic Dirac Fermions in Square Graphynes.
    Author: Zhang LZ, Wang ZF, Wang ZM, Du SX, Gao HJ, Liu F.
    Journal: J Phys Chem Lett; 2015 Aug 06; 6(15):2959-62. PubMed ID: 26267188.
    Abstract:
    We predict a family of 2D carbon (C) allotropes, square graphynes (S-graphynes) that exhibit highly anisotropic Dirac fermions, using first-principle calculations within density functional theory. They have a square unit-cell containing two sizes of square C rings. The equal-energy contour of their 3D band structure shows a crescent shape, and the Dirac crescent has varying Fermi velocities from 0.6 × 10(5) to 7.2 × 10(5) m/s along different k directions. Near the Fermi level, the Dirac crescent can be nicely expressed by an extended 2D Dirac model Hamiltonian. Furthermore, tight-binding band fitting reveals that the Dirac crescent originates from the next-nearest-neighbor interactions between C atoms. S-graphynes may be used to build new 2D electronic devices taking advantages of their highly directional charge transport.
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