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Two-dimensional (2D) carbon materials play an important role innanomaterials. We propose a new carbon monolayer, namedhexagonal-4,4,4-graphyne (H4,4,4-graphyne), which is a nanoporous structurecomposed of rectangular carbon rings and triple bonds of carbon. Usingfirst-principles calculations, we systematically studied the structure,stability, and band structure of this new material. We found that its energy ismuch lower than that of some experimental carbon materials and it is stable atleast up to 1500 K. In contrast to the single Dirac point band structure ofother 2D carbon monolayers, the band structure of H4,4,4-graphyne exhibitsdouble Dirac points along the high symmetry points and the corresponding Fermivelocities (1.04~1.27 * 106 m/s) are asymmetric and higher than that ofgraphene. The origin of these double Dirac points is traced back to the nodalline states, which can be well explained by a tight-binding model. TheH4,4,4-graphyne forms a moir\'e superstructure when placed on top of a BNsubstrate, while keeping the double Dirac points. These properties makeH4,4,4-graphyne a promising semimetal material for applications in high-speedelectronic devices.

New Nanoporous Graphyne Monolayer as Nodal Line Semimetal: Double Dirac Points with an Ultrahigh Fermi Velocity