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The enchanting Dirac fermions in graphene stimulated us to seek for othertwo-dimensional (2D) Dirac materials, and boron monolayers may be a goodcandidate. So far, a number of monolayer boron sheets have been theoreticallypredicted, and three have been experimentally prepared. However, none of thempossesses Dirac electrons. Herein, by means of density functional theory (DFT)computations, we identified a new boron monolayer, namely hr-sB, with two typesof Dirac fermions coexisting in the sheet: one type is related to Dirac nodallines traversing Brillouin zone (BZ) with velocities approaching 106 m/s, theother is related to tilted semi-Dirac cones with strong anisotropy. This newlypredicted boron monolayer consists of hexagon and rhombus stripes. With anexceptional stability comparable to the experimentally achieved boron sheets,it is rather optimistic to grow hr-sB on some suitable substrates such as theAg (111) surface. The unique electronic properties induced by special bondcharacteristics also imply that this boron monolayer may be a goodsuperconductor.

Dirac Nodal Lines and Tilted Semi-Dirac Cones Coexisting in a Striped Boron Sheet