Topological Semimetal-Insulator Quantum Phase Transition in Zintl Compounds Ba2X (X=Si, Ge)

Abstract

By first-principles calculations, we find that Ba2X(X=Si, Ge) hosts a topological semimetal phase with one nodal ring in the kx=0 plane, which is protected by the glide mirror symmetry when spin-orbit coupling (SOC) is ignored. The corresponding drumheadlike surface flat band appears on the (100) surface in surface Green function calculation. Furthermore, a topological-semimetal-to-insulator transition (TSMIT) is found. The nodal line semimetal would evolve into topological insulator as SOC is turned on. The topologically protected metallic surface states emerge around the Gamma=0 point, which could be tuned into topologically-trivial insulator state by more than 3% hydrostatic strain. These results reveal a new category of materials showing quantum phase transition between topological semimetal and insulator, and tunability through elastic strain engineering.

arXiv comment14 pages. 4 figures

References in corpus (31)

• Topological Insulators
• Topological insulators and superconductors
• Quantum Spin Hall Effect in Graphene
• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Electronic Structure of Pyrochlore Iridates: From Topological Dirac Metal to Mott Insulator
• Topological Insulators with Inversion Symmetry
• Wannier90: A Tool for Obtaining Maximally-Localised Wannier Functions
• Discovery of a Weyl Fermion Semimetal and Topological Fermi Arcs
• Discovery of a Three-dimensional Topological Dirac Semimetal, Na3Bi
• Dirac semimetal and topological phase transitions in A3Bi (A=Na, K, Rb)
• Experimental discovery of Weyl semimetal TaAs
• Three Dimensional Dirac Semimetal and Quantum Transports in Cd3As2
• Theoretical Discovery/Prediction: Weyl Semimetal states in the TaAs material (TaAs, NbAs, NbP, TaP) class
• Weyl semimetal phase in non-centrosymmetric transition metal monophosphides
• Observation of a topological 3D Dirac semimetal phase in high-mobility Cd3As2
• The quantum spin Hall effect and topological insulators
• Dirac Line Nodes in Inversion Symmetric Crystals
• Topological Nodal Line Semimetal and Dirac Semimetal State in Antiperovskite Cu${}_3$PdN
• Topological Node-Line Semimetal in Three Dimensional Graphene Networks
• Nodal-chain metals
• High-temperature surface superconductivity in topological flat-band systems
• Topological semi-metals with line nodes and drumhead surface states
• Potential ring of Dirac nodes in a new polymorph of Ca${}_3$P${}_2$
• Drumhead Surface States and Topological Nodal-Line Fermions in TlTaSe2
• Line-Node Dirac Semimetal and Topological Insulating Phase in Noncentrosymmetric Pnictides CaAgX (X = P, As)
• New classes of topological crystalline insulators with unpinned surface Dirac cones
• Topological nodal-line semimetals in alkaline-earth stannides, germanides and silicides
• Topological semimetals and topological insulators in rare earth monopnictides
• Band-Contact Lines in Electron Energy Spectrum of Graphite
• Strain driven onset of non-trivial topological insulating states in Zintl Sr${}_{2}X$ compounds ($X$=Pb, Sn)

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• Coexistence of New Fermions in Topological Semimetal TaS
• Quantum Transport in Topological Semimetals under Magnetic Fields (II)
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• Anisotropic magnetism and electronic structure of trigonal EuAl${}_2$Ge${}_2$ single crystals
• Twist-induced magnon Landau levels in honeycomb magnets
• Spectroscopic Evidence for Dirac Nodal Surfaces and Nodal Rings in Superconductor NaAlSi
• Antiferro- and Meta-magnetism in the S=7/2 Hollandite Analog EuGa2Sb2
• Quantized Hall conductance in 3D topological nodal-line semimetals without chiral symmetry
• Quasi-nodal lines in rhombohedral magnetic materials