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- W2671514051 abstract "Recently, it was shown that quantum spin Hall insulator phase with a gap wide enough for practical applications can be realized in the ultrathin films constructed from two inversely stacked structural elements of trivial band insulator BiTeI. Here, we study the edge states in nanoribbons made of the ${mathrm{Bi}}_{2}{mathrm{Te}}_{2}{mathrm{I}}_{2}$ sextuple layer (SL) and the electronic structure of the SL deposited on the natural BiTeI substrate as well as sandwiched between two thick BiTeI films. We show that the ${mathrm{Bi}}_{2}{mathrm{Te}}_{2}{mathrm{I}}_{2}$ SL keeps nontrivial topological properties. We also demonstrate that ultrathin centrosymmetric films constructed in a similar manner from related material BiTeBr are trivial band insulators up to five-SL film thickness. In contrast to ${mathrm{Bi}}_{2}{mathrm{Te}}_{2}{mathrm{I}}_{2}$ for which the stacking of nontrivial SLs in a three-dimensional (3D) limit results in a strong topological insulator (TI) phase, a 3D TI ${mathrm{Bi}}_{2}{mathrm{Te}}_{2}{mathrm{Br}}_{2}$ is formed by trivial SLs. For the last material of the $mathrm{BiTe}X$ ($X=text{I}$,Br,Cl) series, BiTeCl, both 2D and 3D centrosymmetric phases are characterized by topologically trivial band structure." @default.
- W2671514051 created "2017-06-30" @default.
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- W2671514051 date "2017-10-24" @default.
- W2671514051 modified "2023-09-23" @default.
- W2671514051 title "Two- and three-dimensional topological phases in <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi>BiTe</mml:mi><mml:mi>X</mml:mi></mml:mrow></mml:math> compounds" @default.
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- W2671514051 doi "https://doi.org/10.1103/physrevb.96.155309" @default.
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