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- W4313332647 abstract "Quantum spin Hall (QSH) insulators exhibit spin-polarized conducting edge states that are topologically protected from backscattering and offer unique opportunities to address fundamental science questions and device applications. Finding viable materials that host such topological states, however, remains a continuing challenge. Here, by using in-depth first-principles theoretical modeling, we predict large band gap QSH insulators in the recently synthesized bottom-up two-dimensional $M{mathrm{Si}}_{2}{Z}_{4}$ ($M$ = Mo or W and $Z$ = P or As) material family with $1{T}^{ensuremath{'}}$ structure. A structural distortion in the $2H$ phase drives a band inversion between the metal (Mo/W) $d$ and $p$ states of P/As to realize spinless Dirac states without spin-orbit coupling. When spin-orbit coupling is included, a hybridization gap as large as $ensuremath{sim}204$ meV opens up at the band-crossing points, realizing spin-polarized conducting edge states with nearly quantized spin Hall conductivity. We also show that the inverted band gap can be tuned with a vertical electric field, which drives a topological phase transition from the QSH to a trivial insulator with Rashba-like edge states. Our study identifies the two-dimensional $M{mathrm{Si}}_{2}{Z}_{4}$ material family in the $1{T}^{ensuremath{'}}$ structure as large band gap, tunable QSH insulators with protected spin-polarized edge states and large spin Hall conductivity." @default.
- W4313332647 created "2023-01-06" @default.
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- W4313332647 date "2022-12-29" @default.
- W4313332647 modified "2023-10-17" @default.
- W4313332647 title "Switchable large-gap quantum spin Hall state in the two-dimensional <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>M</mml:mi><mml:mrow><mml:msub><mml:mi mathvariant=normal>Si</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Z</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math> class of materials" @default.
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- W4313332647 doi "https://doi.org/10.1103/physrevb.106.245149" @default.
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