LAUSR

Inspired by the successful synthesis of hHv-graphane[Nano letters 15 903 (2015)], a new 2D Janus material Cu-graphane is proposed based on the first-principle calculations. Without spin-orbit coupling (SOC) effect, Cu-graphane is a Dirac semimetal with a highly anisotropic Dirac cone, whose Fermi velocity ranges from 0.18×105 to 2.9×105 m/s. The Dirac cone near the Fermi level can be well described with an extended 2D Dirac model Hamiltonian. In the presence of SOC effect, band splitting is observed around the Fermi level, and a large intrinsic spin Hall conductivity with a maximum value of 346 (□/e)·S/cm is predicted. Moreover, the spin Hall transport can be regulated by slightly adjusting the Fermi energy, e.g., grid voltage or chemical doping. Our work not only proposes a new 2D Janus material with a highly anisotropic Dirac cone and a large intrinsic spin Hall conductivity, but also reveals that a large spin Hall conductivity may exist in some Dirac systems.