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Topological superconductivity and large spin Hall effect in the kagome family Ti 6 X 4 (X = Bi, Sb, Pb, Tl, and In).
- Source :
-
IScience [iScience] 2022 Dec 17; Vol. 26 (1), pp. 105813. Date of Electronic Publication: 2022 Dec 17 (Print Publication: 2023). - Publication Year :
- 2022
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Abstract
- Topological superconductors (TSC) become a focus of research due to the accompanying Majorana fermions. However, the reported TSC are extremely rare. Recent experiments reported kagome TSC AV <subscript>3</subscript> Sb <subscript>5</subscript> (A = K, Rb, and Cs) exhibit unique superconductivity, topological surface states (TSS), and Majorana bound states. More recently, the first titanium-based kagome superconductor CsTi <subscript>3</subscript> Bi <subscript>5</subscript> with nontrivial topology was successfully synthesized as a perspective TSC. Given that Cs contributes little to electronic structures of CsTi <subscript>3</subscript> Bi <subscript>5</subscript> and binary compounds may be easier to be synthesized, here, by first-principle calculations, we predict five stable nonmagnetic kagome compounds Ti <subscript>6</subscript> X <subscript>4</subscript> (X = Bi, Sb, Pb, Tl, and In) which exhibit superconductivity with critical temperature Tc = 3.8 K - 5.1 K, nontrivial Z 2 band topology, and TSS close to the Fermi level. Additionally, large intrinsic spin Hall effect is obtained in Ti <subscript>6</subscript> X <subscript>4</subscript> , which is caused by gapped Dirac nodal lines due to a strong spin-orbit coupling. This work offers new platforms for TSC and spintronic devices.<br />Competing Interests: The authors declare no competing interests.<br /> (© 2022 The Author(s).)
Details
- Language :
- English
- ISSN :
- 2589-0042
- Volume :
- 26
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- IScience
- Publication Type :
- Academic Journal
- Accession number :
- 36619974
- Full Text :
- https://doi.org/10.1016/j.isci.2022.105813