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Electronic and spin structure of a family of Sn-based ternary topological insulators M. G. Vergniory, T. V. Menshchikova, I. V. Silkin [et.al.]

Contributor(s): Vergniory, M. G | Silkin, I. V | Koroteev, Yury M | Eremeev, Sergey V | Chulkov, Evgueni V | Menshchikova, Tatiana VMaterial type: ArticleArticleSubject(s): топологические изоляторы | спиновая поляризацияGenre/Form: статьи в журналах Online resources: Click here to access online In: Physical Review B Vol. 92, № 4. P. 045134-1-045134-7Abstract: We report the bulk and surface electronic properties and spin polarization of a rich family of Sn-based ternary topological insulators studied by means of first-principles calculations within the framework of density functional theory. These compounds exist with the following stoichiometries: SnX2Te4,SnX4Te7, and SnBi6Te10 (X = Sb and Bi). Where a septuple layer or a quintuple layer and septuple layer blocks alternate along the hexagonal axis. We reveal that the bulk band gap in these compounds is about 100 meV and recognize a strong dependence of the spin polarization on the cleavage surface. The calculated spin polarization reaches 85% in some cases, that is one of the highest predicted values hitherto. Since the electron spin polarization is a relevant parameter for spintronics technology, this new family is suitable for applications within this field.
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We report the bulk and surface electronic properties and spin polarization of a rich family of Sn-based ternary topological insulators studied by means of first-principles calculations within the framework of density functional theory. These compounds exist with the following stoichiometries: SnX2Te4,SnX4Te7, and SnBi6Te10 (X = Sb and Bi). Where a septuple layer or a quintuple layer and septuple layer blocks alternate along the hexagonal axis. We reveal that the bulk band gap in these compounds is about 100 meV and recognize a strong dependence of the spin polarization on the cleavage surface. The calculated spin polarization reaches 85% in some cases, that is one of the highest predicted values hitherto. Since the electron spin polarization is a relevant parameter for spintronics technology, this new family is suitable for applications within this field.

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