Quantum Spin Hall Effect in 2D Transition Metal Dichalcogenide Haeckelites

Abstract

By using first-principles calculation, we have found that a family of 2D transition metal dichalcogenide haeckelites with square-octagonal lattice $M{X}_2$-4-8 ($M$=Mo, W and $X$=S, Se and Te) can host quantum spin hall effect. The phonon spectra indicate that they are dynamically stable and the largest band gap is predicted to be around 54 meV, higher than room temperature. These will pave the way to potential applications of topological insulators. We have also established a simple tight-binding model on a square-like lattice to achieve topological nontrivial quantum states, which extends the study from honeycomb lattice to square-like lattice and broads the potential topological material system greatly.

arXiv comment16 pages, 7 figures and simple TB model for square lattice achieving QSH state

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• Robust topological edge states at the perfect surface step edge of topological insulator ZrTe${}_5$
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• Experimental evidence of large-gap two-dimensional topological insulator on the surface of ZrTe5
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• Theoretical Prediction of Two-Dimensional Functionalized MXene Nitrides as Topological Insulators
• Understanding topological phase transition in transition metal dichalcogenides
• Two-Dimensional Transition Metal Dichalcogenides with a Hexagonal Lattice: Room Temperature Quantum Spin Hall Insulators
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