Stable Dirac semi-metal in the allotrope of IV elements

Abstract

Three dimensional topological Dirac semi-metals represent a novel state of quantum matter with exotic electronic properties, in which a pair of Dirac points with the linear dispersion along all momentum directions exist in the bulk. Herein, by using the first principles calculations, we discover a new metastable allotrope of Ge and Sn in the staggered layered dumbbell structure, named as germancite and stancite, to be Dirac semi-metals with a pair of Dirac points on its rotation axis. On the surface parallel to the rotation axis, a pair of topologically non-trivial 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 new metastable allotrope of Ge and Sn.

arXiv comment4 figures

References in corpus (32)

• Wannier90: A Tool for Obtaining Maximally-Localised Wannier Functions
• Two and one-dimensional honeycomb structures of silicon and germanium
• Discovery of a Three-dimensional Topological Dirac Semimetal, Na3Bi
• Dirac semimetal and topological phase transitions in A3Bi (A=Na, K, Rb)
• Epitaxial Growth of Two-Dimensional Stanene
• Dirac semimetal in three dimensions
• Topological nodal semimetals
• Three Dimensional Dirac Semimetal and Quantum Transports in Cd3As2
• Germanene: a novel two-dimensional Germanium allotrope akin to Graphene and Silicene
• Ultrahigh mobility and giant magnetoresistance in the Dirac semimetal Cd${}_3$As${}_2$
• Large-gap quantum spin Hall insulators in tin films
• Experimental Realization of a Three-Dimensional Dirac Semimetal
• Classification of stable three-dimensional Dirac semimetals with nontrivial topology
• Quantum Oscillations from Surface Fermi-Arcs in Weyl and Dirac Semi-Metals
• Dynamical Axion Field in Topological Magnetic Insulators
• Bulk Topological Invariants in Noninteracting Point Group Symmetric Insulators
• Landau Quantization and Quasiparticle Interference in the Three-Dimensional Dirac Semimetal Cd3As2
• Quantum transport evidence for a three-dimensional Dirac semimetal phase in Cd3As2
• Linear magnetoresistance caused by mobility fluctuations in the n-doped Cd3As2
• 3D Dirac semimetals: current materials, design principles and predictions of new materials
• Functionalized Germanene as a Prototype of Large-Gap Two-Dimensional Topological Insulators
• A sudden collapse in the transport lifetime across the topological phase transition in $(B{i}_{1-x}I{n}_x{)}_{2}S{e}_3$
• Unexpected mass acquisition of Dirac fermions at the quantum phase transition of a topological insulator
• On the electronic structure of silicene on Ag substrate: strong hybridization effects
• Bulk Dirac points in distorted spinels
• Interface-induced Topological Insulator Transition in GaAs/Ge/GaAs Quantum Wells
• The atomic structure of the $\sqrt{3}\times \sqrt{3}$ phase of silicene on Ag(111)
• Weyl and Dirac semimetals with Z_2 topological charge
• Silicite: the layered allotrope of silicon
• Dirac and Weyl Semimetal in XYBi (X=Ba, Eu; Y=Cu, Ag and Au)
• Topological phase transitions in (Bi${}_{1-x}$In${}_x{)}_2$Se${}_3$ and (Bi${}_{1-x}$Sb${}_x{)}_2$Se${}_3$
• Dirac semimetals $A_{3}Bi$ ($A$=Na,K,Rb) as $Z_2$ Weyl semimetals

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