Topological Node-Line Semimetal in Three Dimensional Graphene Networks

ORAL

Abstract

Graphene, a two dimensional (2D) carbon sheet, acquires many of its amazing properties from the Dirac point nature of its electronic structures with negligible spin-orbit coupling. Extending to 3D space, graphene networks with negative curvature, called Mackay-Terrones crystals (MTC), have been proposed and experimentally explored, yet their topological properties remain to be discovered. Based on the first-principle calculations, we report an all-carbon MTC with topologically non-trivial electronic states by exhibiting node-lines in bulk. When the node-lines are projected on to surfaces to form circles, ``drumhead'' like flat surface bands nestled inside of the circles are formed. The bulk node-line can evolve into 3D Dirac point in the absence of inversion symmetry, which has shown its plausible existence in recent experiments.

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Authors

  • Hongming Weng

    • Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences

  • Yunye Liang

    • New Industry Creation Hatchery Center, Tohoku University, Japan

  • Qiunan Xu

    • Institute of Physics, Chinese Academy of Sciences

  • Rui Yu

    • International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science
    • International Center for Materials Nanoarchitectornics (WPI-MANA) National Institute for Materials Science, Tsukuba 305-0044, Japan

  • Zhong Fang

    • Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences

  • Xi Dai

    • Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences

  • Yoshiyuki Kawazoe

    • New Industry Creation Hatchery Center, Tohoku University, Japan \& Thermophysics Institute, Siberian Branch, Russian Academy of Sciences, Russia