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Stable Dirac semimetal in the allotropes of group-IV elements

机译：IV族元素同素异形体中稳定的狄拉克半金属

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摘要

Three-dimensional topological Dirac semimetals represent a novel state of quantum matter with exotic electronic properties, in which a pair of Dirac points with a linear dispersion along all momentum directions exists in the bulk. Herein, by using first-principles calculations, we discover the metastable allotropes of Ge and Sn in the staggered layered dumbbell structure, named germancite and stancite, to be Dirac semimetals with a pair of Dirac points on their rotation axis. On the surface parallel to the rotation axis, a pair of topoiogically nontrivial Fermi arcs are observed and a Lifshitz transition is found by tuning the Fermi level. Furthermore, the quantum thin film of germancite is found to be an intrinsic quantum spin Hall insulator. These discoveries suggest novel physical properties and future applications of the metastable allotrope of Ge and Sn.
机译：三维拓扑狄拉克半金属代表具有奇异电子性质的量子物质的一种新状态，其中在主体中存在一对沿所有动量方向线性分散的狄拉克点。在这里，通过第一性原理的计算，我们发现了交错层状哑铃结构中名为锗石和锡石的亚稳态同素异形体是狄拉克半金属，其旋转轴上有一对狄拉克点。在平行于旋转轴的表面上，观察到一对拓扑学上不重要的费米弧，并且通过调整费米能级发现了李夫希兹跃迁。此外，发现锗石的量子薄膜是本征量子自旋霍尔绝缘体。这些发现暗示了Ge和Sn的亚稳态同素异形体的新颖的物理性质和未来的应用。

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  • 来源
    《Physical review》 |2016年第24期|241117.1-241117.6|共6页
  • 作者

    Wendong Cao; Peizhe Tang; Shou-Cheng Zhang; Wenhui Duan; Angel Rubio;

  • 作者单位

    State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084,People's Republic of China;

    Department of Physics, McCullough Building, Stanford University, Stanford, California 94305-4045, USA,Collaborative Innovation Center of Quantum Matter, Beijing 100084, People's Republic of China;

    Department of Physics, McCullough Building, Stanford University, Stanford, California 94305-4045, USA;

    State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084,People's Republic of China,Institute for Advanced Study, Tsinghua University, Beijing 100084, People's Republic of China,Collaborative Innovation Center of Quantum Matter, Beijing 100084, People's Republic of China;

    Max Planck Institute for the Structure and Dynamics of Matter and Center for Free-Electron Laser Science, Lumper Chaussee 149, 22761 Hamburg, Germany,Nano-Bio Spectroscopy group, Dpto. Fisica de Materiales, Universidad del Pais Wasco, Centro de Fisica de Materiales CSIC-UPV/EHU-MPC and DIPC, Av. Tolosa 72, E-20018 San Sebastian, Spain;

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