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• W2530929735 abstract "Two-dimensional (2D) topological insulators (TIs) are recently recognized states of quantum matter that are highly interesting for lower-power-consuming electronic devices owing to their nondissipative transport properties protected from backscattering. So far, only few 2D TIs, suffering from small bulk band gap ($<10phantom{rule{0.16em}{0ex}}mathrm{meV}$), have been experimentally confirmed. Here, through first-principles calculations, we propose a family of 2D TIs in group-11 chalcogenide 2D crystals, ${M}_{2}mathrm{Te}phantom{rule{0.28em}{0ex}}(M=mathrm{Cu},phantom{rule{0.16em}{0ex}}mathrm{Ag})$. The nontrivial topological states in $mathrm{C}{mathrm{u}}_{2}mathrm{Te}$ and $mathrm{A}{mathrm{g}}_{2}mathrm{Te}$ 2D crystals, identified by topological invariant and edge state calculations, exhibit sizeable bulk gaps of 78 and 150 meV, respectively, suggesting that they are candidates for room-temperature applications. Moreover, strain engineering leads to effective control of the nontrivial gaps of $mathrm{C}{mathrm{u}}_{2}mathrm{Te}$ and $mathrm{A}{mathrm{g}}_{2}mathrm{Te}$, and a topological phase transition can be realized in $mathrm{C}{mathrm{u}}_{2}mathrm{Te}$, while the nontrivial phase in $mathrm{A}{mathrm{g}}_{2}mathrm{Te}$ is stable against strain. Their dynamic and thermal stabilities are further confirmed by employing phonon calculations and ab initio molecular dynamic simulations." @default.
• W2530929735 created "2016-10-21" @default.
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• W2530929735 date "2016-06-29" @default.
• W2530929735 modified "2023-10-11" @default.
• W2530929735 title "Two-dimensional topological insulators in group-11 chalcogenide compounds:<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi>M</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi>Te</mml:mi><mml:mspace width=0.28em /><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mi>M</mml:mi><mml:mo>=</mml:mo><mml:mi>Cu</mml:mi><mml:mo>,</mml:mo><mml:mspace width=0.16em /><mml:mi>Ag</mml:mi></mml:mrow><mml:mo>)</mml:mo></mml:mrow></mml:mrow></mml:math>" @default.
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• W2530929735 doi "https://doi.org/10.1103/physrevb.93.235451" @default.
• W2530929735 hasPublicationYear "2016" @default.
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