Quantum spin Hall effect in monolayer and bilayer TaIrTe${}_4$

Abstract

Generally, stacking two quantum spin Hall insulators gives rise to a trivial insulator. Here, based on first-principles electronic structure calculations, we confirm that monolayer TaIrTe${}_4$ is a quantum spin Hall insulator and remarkably find that bilayer TaIrTe${}_4$ is still a quantum spin Hall insulator. Theoretical analysis indicates that the covalent-like interlayer interaction in combination with the small bandgap at time-reversal invariant $\Gamma$ point results in new band inversion in bilayer TaIrTe${}_4$, namely, the emergence of quantum spin Hall phase. Meanwhile, a topological phase transition can be observed by increasing the interlayer distance in bilayer TaIrTe${}_4$. Considering that bulk TaIrTe${}_4$ is a type-II Weyl semimetal, layered TaIrTe${}_4$ thus provides an ideal platform to realize different topological phases at different dimensions.

arXiv comment5 pages, 7 figures

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• Layered van der Waals topological metals of TaTMTe4 (TM = Ir, Rh, Ru) family
• Optical valley separation in two-dimensional semimetals with tilted Dirac cones
• Polarizability, plasmons, and screening in 1T${}^{\prime }$-MoS${}_2$ with tilted Dirac bands
• A complementary screening for quantum spin Hall insulators in 2D exfoliable materials
• Programmable, Spontaneous Superlattice Memory in a Monolayer Topological Insulator
• Strain-dependent one-dimensional confinement channels in twisted bilayer 1T${}^{\prime }$-WTe${}_2$
• Exciton Condensation in Landau Levels of Quantum Spin Hall Insulators
• Strain modulation of photocurrent in Weyl semimetal TaIrTe4
• Layer dependent topological phases and transitions in TaRhTe${}_4$: From monolayer and bilayer to bulk
• Quantum spin Hall effect in bilayer honeycomb lattices with C-type antiferromagnetic order
• Designer gapped and tilted Dirac cones in lateral graphene superlattices